:: Arithmetic Operations on Functions from Sets into Functional Sets
:: by Artur Korni{\l}owicz
::
:: Received October 15, 2008
:: Copyright (c) 2008-2011 Association of Mizar Users


begin

Lm1: now
let X1, X2, X3 be set ; :: thesis: X1 /\ (X2 /\ X3) = (X1 /\ X2) /\ (X1 /\ X3)
thus X1 /\ (X2 /\ X3) = ((X1 /\ X1) /\ X2) /\ X3 by XBOOLE_1:16
.= (X1 /\ (X1 /\ X2)) /\ X3 by XBOOLE_1:16
.= (X1 /\ X2) /\ (X1 /\ X3) by XBOOLE_1:16 ; :: thesis: verum
end;

definition
let Y be functional set ;
func DOMS Y -> set equals :: VALUED_2:def 1
union { (dom f) where f is Element of Y : verum } ;
coherence
union { (dom f) where f is Element of Y : verum } is set
;
end;

:: deftheorem defines DOMS VALUED_2:def 1 :
for Y being functional set holds DOMS Y = union { (dom f) where f is Element of Y : verum } ;

definition
let X be set ;
attr X is complex-functions-membered means :Def2: :: VALUED_2:def 2
for x being set st x in X holds
x is complex-valued Function;
end;

:: deftheorem Def2 defines complex-functions-membered VALUED_2:def 2 :
for X being set holds
( X is complex-functions-membered iff for x being set st x in X holds
x is complex-valued Function );

definition
let X be set ;
attr X is ext-real-functions-membered means :Def3: :: VALUED_2:def 3
for x being set st x in X holds
x is ext-real-valued Function;
end;

:: deftheorem Def3 defines ext-real-functions-membered VALUED_2:def 3 :
for X being set holds
( X is ext-real-functions-membered iff for x being set st x in X holds
x is ext-real-valued Function );

definition
let X be set ;
attr X is real-functions-membered means :Def4: :: VALUED_2:def 4
for x being set st x in X holds
x is real-valued Function;
end;

:: deftheorem Def4 defines real-functions-membered VALUED_2:def 4 :
for X being set holds
( X is real-functions-membered iff for x being set st x in X holds
x is real-valued Function );

definition
let X be set ;
attr X is rational-functions-membered means :Def5: :: VALUED_2:def 5
for x being set st x in X holds
x is rational-valued Function;
end;

:: deftheorem Def5 defines rational-functions-membered VALUED_2:def 5 :
for X being set holds
( X is rational-functions-membered iff for x being set st x in X holds
x is rational-valued Function );

definition
let X be set ;
attr X is integer-functions-membered means :Def6: :: VALUED_2:def 6
for x being set st x in X holds
x is integer-valued Function;
end;

:: deftheorem Def6 defines integer-functions-membered VALUED_2:def 6 :
for X being set holds
( X is integer-functions-membered iff for x being set st x in X holds
x is integer-valued Function );

definition
let X be set ;
attr X is natural-functions-membered means :Def7: :: VALUED_2:def 7
for x being set st x in X holds
x is natural-valued Function;
end;

:: deftheorem Def7 defines natural-functions-membered VALUED_2:def 7 :
for X being set holds
( X is natural-functions-membered iff for x being set st x in X holds
x is natural-valued Function );

registration
cluster natural-functions-membered -> integer-functions-membered set ;
coherence
for b1 being set st b1 is natural-functions-membered holds
b1 is integer-functions-membered
proof end;
cluster integer-functions-membered -> rational-functions-membered set ;
coherence
for b1 being set st b1 is integer-functions-membered holds
b1 is rational-functions-membered
proof end;
cluster rational-functions-membered -> real-functions-membered set ;
coherence
for b1 being set st b1 is rational-functions-membered holds
b1 is real-functions-membered
proof end;
cluster real-functions-membered -> complex-functions-membered set ;
coherence
for b1 being set st b1 is real-functions-membered holds
b1 is complex-functions-membered
proof end;
cluster real-functions-membered -> ext-real-functions-membered set ;
coherence
for b1 being set st b1 is real-functions-membered holds
b1 is ext-real-functions-membered
proof end;
end;

registration
cluster empty -> natural-functions-membered set ;
coherence
for b1 being set st b1 is empty holds
b1 is natural-functions-membered
proof end;
end;

registration
let f be complex-valued Function;
cluster {f} -> complex-functions-membered ;
coherence
{f} is complex-functions-membered
proof end;
end;

registration
cluster complex-functions-membered -> functional set ;
coherence
for b1 being set st b1 is complex-functions-membered holds
b1 is functional
proof end;
cluster ext-real-functions-membered -> functional set ;
coherence
for b1 being set st b1 is ext-real-functions-membered holds
b1 is functional
proof end;
end;

set ff = the natural-valued Function;

registration
cluster non empty natural-functions-membered set ;
existence
ex b1 being set st
( b1 is natural-functions-membered & not b1 is empty )
proof end;
end;

registration
let X be complex-functions-membered set ;
cluster -> complex-functions-membered Element of K21(X);
coherence
for b1 being Subset of X holds b1 is complex-functions-membered
proof end;
end;

registration
let X be ext-real-functions-membered set ;
cluster -> ext-real-functions-membered Element of K21(X);
coherence
for b1 being Subset of X holds b1 is ext-real-functions-membered
proof end;
end;

registration
let X be real-functions-membered set ;
cluster -> real-functions-membered Element of K21(X);
coherence
for b1 being Subset of X holds b1 is real-functions-membered
proof end;
end;

registration
let X be rational-functions-membered set ;
cluster -> rational-functions-membered Element of K21(X);
coherence
for b1 being Subset of X holds b1 is rational-functions-membered
proof end;
end;

registration
let X be integer-functions-membered set ;
cluster -> integer-functions-membered Element of K21(X);
coherence
for b1 being Subset of X holds b1 is integer-functions-membered
proof end;
end;

registration
let X be natural-functions-membered set ;
cluster -> natural-functions-membered Element of K21(X);
coherence
for b1 being Subset of X holds b1 is natural-functions-membered
proof end;
end;

definition
set A = COMPLEX ;
let D be set ;
defpred S1[ set ] means $1 is PartFunc of D,COMPLEX;
func C_PFuncs D -> set means :Def8: :: VALUED_2:def 8
for f being set holds
( f in it iff f is PartFunc of D,COMPLEX );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is PartFunc of D,COMPLEX )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is PartFunc of D,COMPLEX ) ) & ( for f being set holds
( f in b2 iff f is PartFunc of D,COMPLEX ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def8 defines C_PFuncs VALUED_2:def 8 :
for D, b2 being set holds
( b2 = C_PFuncs D iff for f being set holds
( f in b2 iff f is PartFunc of D,COMPLEX ) );

definition
set A = COMPLEX ;
let D be set ;
defpred S1[ set ] means $1 is Function of D,COMPLEX;
func C_Funcs D -> set means :Def9: :: VALUED_2:def 9
for f being set holds
( f in it iff f is Function of D,COMPLEX );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is Function of D,COMPLEX )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is Function of D,COMPLEX ) ) & ( for f being set holds
( f in b2 iff f is Function of D,COMPLEX ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def9 defines C_Funcs VALUED_2:def 9 :
for D, b2 being set holds
( b2 = C_Funcs D iff for f being set holds
( f in b2 iff f is Function of D,COMPLEX ) );

definition
set A = ExtREAL ;
let D be set ;
defpred S1[ set ] means $1 is PartFunc of D,ExtREAL;
func E_PFuncs D -> set means :Def10: :: VALUED_2:def 10
for f being set holds
( f in it iff f is PartFunc of D,ExtREAL );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is PartFunc of D,ExtREAL )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is PartFunc of D,ExtREAL ) ) & ( for f being set holds
( f in b2 iff f is PartFunc of D,ExtREAL ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def10 defines E_PFuncs VALUED_2:def 10 :
for D, b2 being set holds
( b2 = E_PFuncs D iff for f being set holds
( f in b2 iff f is PartFunc of D,ExtREAL ) );

definition
set A = ExtREAL ;
let D be set ;
defpred S1[ set ] means $1 is Function of D,ExtREAL;
func E_Funcs D -> set means :Def11: :: VALUED_2:def 11
for f being set holds
( f in it iff f is Function of D,ExtREAL );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is Function of D,ExtREAL )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is Function of D,ExtREAL ) ) & ( for f being set holds
( f in b2 iff f is Function of D,ExtREAL ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def11 defines E_Funcs VALUED_2:def 11 :
for D, b2 being set holds
( b2 = E_Funcs D iff for f being set holds
( f in b2 iff f is Function of D,ExtREAL ) );

definition
set A = REAL ;
let D be set ;
defpred S1[ set ] means $1 is PartFunc of D,REAL;
func R_PFuncs D -> set means :Def12: :: VALUED_2:def 12
for f being set holds
( f in it iff f is PartFunc of D,REAL );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is PartFunc of D,REAL )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is PartFunc of D,REAL ) ) & ( for f being set holds
( f in b2 iff f is PartFunc of D,REAL ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def12 defines R_PFuncs VALUED_2:def 12 :
for D, b2 being set holds
( b2 = R_PFuncs D iff for f being set holds
( f in b2 iff f is PartFunc of D,REAL ) );

definition
set A = REAL ;
let D be set ;
defpred S1[ set ] means $1 is Function of D,REAL;
func R_Funcs D -> set means :Def13: :: VALUED_2:def 13
for f being set holds
( f in it iff f is Function of D,REAL );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is Function of D,REAL )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is Function of D,REAL ) ) & ( for f being set holds
( f in b2 iff f is Function of D,REAL ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def13 defines R_Funcs VALUED_2:def 13 :
for D, b2 being set holds
( b2 = R_Funcs D iff for f being set holds
( f in b2 iff f is Function of D,REAL ) );

definition
set A = RAT ;
let D be set ;
defpred S1[ set ] means $1 is PartFunc of D,RAT;
func Q_PFuncs D -> set means :Def14: :: VALUED_2:def 14
for f being set holds
( f in it iff f is PartFunc of D,RAT );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is PartFunc of D,RAT )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is PartFunc of D,RAT ) ) & ( for f being set holds
( f in b2 iff f is PartFunc of D,RAT ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def14 defines Q_PFuncs VALUED_2:def 14 :
for D, b2 being set holds
( b2 = Q_PFuncs D iff for f being set holds
( f in b2 iff f is PartFunc of D,RAT ) );

definition
set A = RAT ;
let D be set ;
defpred S1[ set ] means $1 is Function of D,RAT;
func Q_Funcs D -> set means :Def15: :: VALUED_2:def 15
for f being set holds
( f in it iff f is Function of D,RAT );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is Function of D,RAT )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is Function of D,RAT ) ) & ( for f being set holds
( f in b2 iff f is Function of D,RAT ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def15 defines Q_Funcs VALUED_2:def 15 :
for D, b2 being set holds
( b2 = Q_Funcs D iff for f being set holds
( f in b2 iff f is Function of D,RAT ) );

definition
set A = INT ;
let D be set ;
defpred S1[ set ] means $1 is PartFunc of D,INT;
func I_PFuncs D -> set means :Def16: :: VALUED_2:def 16
for f being set holds
( f in it iff f is PartFunc of D,INT );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is PartFunc of D,INT )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is PartFunc of D,INT ) ) & ( for f being set holds
( f in b2 iff f is PartFunc of D,INT ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def16 defines I_PFuncs VALUED_2:def 16 :
for D, b2 being set holds
( b2 = I_PFuncs D iff for f being set holds
( f in b2 iff f is PartFunc of D,INT ) );

definition
set A = INT ;
let D be set ;
defpred S1[ set ] means $1 is Function of D,INT;
func I_Funcs D -> set means :Def17: :: VALUED_2:def 17
for f being set holds
( f in it iff f is Function of D,INT );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is Function of D,INT )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is Function of D,INT ) ) & ( for f being set holds
( f in b2 iff f is Function of D,INT ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def17 defines I_Funcs VALUED_2:def 17 :
for D, b2 being set holds
( b2 = I_Funcs D iff for f being set holds
( f in b2 iff f is Function of D,INT ) );

definition
set A = NAT ;
let D be set ;
defpred S1[ set ] means $1 is PartFunc of D,NAT;
func N_PFuncs D -> set means :Def18: :: VALUED_2:def 18
for f being set holds
( f in it iff f is PartFunc of D,NAT );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is PartFunc of D,NAT )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is PartFunc of D,NAT ) ) & ( for f being set holds
( f in b2 iff f is PartFunc of D,NAT ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def18 defines N_PFuncs VALUED_2:def 18 :
for D, b2 being set holds
( b2 = N_PFuncs D iff for f being set holds
( f in b2 iff f is PartFunc of D,NAT ) );

definition
set A = NAT ;
let D be set ;
defpred S1[ set ] means $1 is Function of D,NAT;
func N_Funcs D -> set means :Def19: :: VALUED_2:def 19
for f being set holds
( f in it iff f is Function of D,NAT );
existence
ex b1 being set st
for f being set holds
( f in b1 iff f is Function of D,NAT )
proof end;
uniqueness
for b1, b2 being set st ( for f being set holds
( f in b1 iff f is Function of D,NAT ) ) & ( for f being set holds
( f in b2 iff f is Function of D,NAT ) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def19 defines N_Funcs VALUED_2:def 19 :
for D, b2 being set holds
( b2 = N_Funcs D iff for f being set holds
( f in b2 iff f is Function of D,NAT ) );

theorem Th1: :: VALUED_2:1
for X being set holds C_Funcs X is Subset of (C_PFuncs X)
proof end;

theorem Th2: :: VALUED_2:2
for X being set holds E_Funcs X is Subset of (E_PFuncs X)
proof end;

theorem Th3: :: VALUED_2:3
for X being set holds R_Funcs X is Subset of (R_PFuncs X)
proof end;

theorem Th4: :: VALUED_2:4
for X being set holds Q_Funcs X is Subset of (Q_PFuncs X)
proof end;

theorem Th5: :: VALUED_2:5
for X being set holds I_Funcs X is Subset of (I_PFuncs X)
proof end;

theorem Th6: :: VALUED_2:6
for X being set holds N_Funcs X is Subset of (N_PFuncs X)
proof end;

registration
let X be set ;
cluster C_PFuncs X -> complex-functions-membered ;
coherence
C_PFuncs X is complex-functions-membered
proof end;
cluster C_Funcs X -> complex-functions-membered ;
coherence
C_Funcs X is complex-functions-membered
proof end;
cluster E_PFuncs X -> ext-real-functions-membered ;
coherence
E_PFuncs X is ext-real-functions-membered
proof end;
cluster E_Funcs X -> ext-real-functions-membered ;
coherence
E_Funcs X is ext-real-functions-membered
proof end;
cluster R_PFuncs X -> real-functions-membered ;
coherence
R_PFuncs X is real-functions-membered
proof end;
cluster R_Funcs X -> real-functions-membered ;
coherence
R_Funcs X is real-functions-membered
proof end;
cluster Q_PFuncs X -> rational-functions-membered ;
coherence
Q_PFuncs X is rational-functions-membered
proof end;
cluster Q_Funcs X -> rational-functions-membered ;
coherence
Q_Funcs X is rational-functions-membered
proof end;
cluster I_PFuncs X -> integer-functions-membered ;
coherence
I_PFuncs X is integer-functions-membered
proof end;
cluster I_Funcs X -> integer-functions-membered ;
coherence
I_Funcs X is integer-functions-membered
proof end;
cluster N_PFuncs X -> natural-functions-membered ;
coherence
N_PFuncs X is natural-functions-membered
proof end;
cluster N_Funcs X -> natural-functions-membered ;
coherence
N_Funcs X is natural-functions-membered
proof end;
end;

registration
let X be complex-functions-membered set ;
cluster -> complex-valued Element of X;
coherence
for b1 being Element of X holds b1 is complex-valued
proof end;
end;

registration
let X be ext-real-functions-membered set ;
cluster -> ext-real-valued Element of X;
coherence
for b1 being Element of X holds b1 is ext-real-valued
proof end;
end;

registration
let X be real-functions-membered set ;
cluster -> real-valued Element of X;
coherence
for b1 being Element of X holds b1 is real-valued
proof end;
end;

registration
let X be rational-functions-membered set ;
cluster -> rational-valued Element of X;
coherence
for b1 being Element of X holds b1 is rational-valued
proof end;
end;

registration
let X be integer-functions-membered set ;
cluster -> integer-valued Element of X;
coherence
for b1 being Element of X holds b1 is integer-valued
proof end;
end;

registration
let X be natural-functions-membered set ;
cluster -> natural-valued Element of X;
coherence
for b1 being Element of X holds b1 is natural-valued
proof end;
end;

registration
let X, x be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> Relation-like Function-like ;
coherence
( f . x is Function-like & f . x is Relation-like )
proof end;
end;

registration
let X, x be set ;
let Y be ext-real-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> Relation-like Function-like ;
coherence
( f . x is Function-like & f . x is Relation-like )
proof end;
end;

registration
let X, x be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> complex-valued ;
coherence
f . x is complex-valued
proof end;
end;

registration
let X, x be set ;
let Y be ext-real-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> ext-real-valued ;
coherence
f . x is ext-real-valued
proof end;
end;

registration
let X, x be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> real-valued ;
coherence
f . x is real-valued
proof end;
end;

registration
let X, x be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> rational-valued ;
coherence
f . x is rational-valued
proof end;
end;

registration
let X, x be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> integer-valued ;
coherence
f . x is integer-valued
proof end;
end;

registration
let X, x be set ;
let Y be natural-functions-membered set ;
let f be PartFunc of X,Y;
cluster f . x -> natural-valued ;
coherence
f . x is natural-valued
proof end;
end;

registration
let X be set ;
let Y be complex-membered set ;
cluster PFuncs (X,Y) -> complex-functions-membered ;
coherence
PFuncs (X,Y) is complex-functions-membered
proof end;
end;

registration
let X be set ;
let Y be ext-real-membered set ;
cluster PFuncs (X,Y) -> ext-real-functions-membered ;
coherence
PFuncs (X,Y) is ext-real-functions-membered
proof end;
end;

registration
let X be set ;
let Y be real-membered set ;
cluster PFuncs (X,Y) -> real-functions-membered ;
coherence
PFuncs (X,Y) is real-functions-membered
proof end;
end;

registration
let X be set ;
let Y be rational-membered set ;
cluster PFuncs (X,Y) -> rational-functions-membered ;
coherence
PFuncs (X,Y) is rational-functions-membered
proof end;
end;

registration
let X be set ;
let Y be integer-membered set ;
cluster PFuncs (X,Y) -> integer-functions-membered ;
coherence
PFuncs (X,Y) is integer-functions-membered
proof end;
end;

registration
let X be set ;
let Y be natural-membered set ;
cluster PFuncs (X,Y) -> natural-functions-membered ;
coherence
PFuncs (X,Y) is natural-functions-membered
proof end;
end;

registration
let X be set ;
let Y be complex-membered set ;
cluster Funcs (X,Y) -> complex-functions-membered ;
coherence
Funcs (X,Y) is complex-functions-membered
proof end;
end;

registration
let X be set ;
let Y be ext-real-membered set ;
cluster Funcs (X,Y) -> ext-real-functions-membered ;
coherence
Funcs (X,Y) is ext-real-functions-membered
proof end;
end;

registration
let X be set ;
let Y be real-membered set ;
cluster Funcs (X,Y) -> real-functions-membered ;
coherence
Funcs (X,Y) is real-functions-membered
proof end;
end;

registration
let X be set ;
let Y be rational-membered set ;
cluster Funcs (X,Y) -> rational-functions-membered ;
coherence
Funcs (X,Y) is rational-functions-membered
proof end;
end;

registration
let X be set ;
let Y be integer-membered set ;
cluster Funcs (X,Y) -> integer-functions-membered ;
coherence
Funcs (X,Y) is integer-functions-membered
proof end;
end;

registration
let X be set ;
let Y be natural-membered set ;
cluster Funcs (X,Y) -> natural-functions-membered ;
coherence
Funcs (X,Y) is natural-functions-membered
proof end;
end;

definition
let R be Relation;
attr R is complex-functions-valued means :Def20: :: VALUED_2:def 20
rng R is complex-functions-membered ;
attr R is ext-real-functions-valued means :Def21: :: VALUED_2:def 21
rng R is ext-real-functions-membered ;
attr R is real-functions-valued means :Def22: :: VALUED_2:def 22
rng R is real-functions-membered ;
attr R is rational-functions-valued means :Def23: :: VALUED_2:def 23
rng R is rational-functions-membered ;
attr R is integer-functions-valued means :Def24: :: VALUED_2:def 24
rng R is integer-functions-membered ;
attr R is natural-functions-valued means :Def25: :: VALUED_2:def 25
rng R is natural-functions-membered ;
end;

:: deftheorem Def20 defines complex-functions-valued VALUED_2:def 20 :
for R being Relation holds
( R is complex-functions-valued iff rng R is complex-functions-membered );

:: deftheorem Def21 defines ext-real-functions-valued VALUED_2:def 21 :
for R being Relation holds
( R is ext-real-functions-valued iff rng R is ext-real-functions-membered );

:: deftheorem Def22 defines real-functions-valued VALUED_2:def 22 :
for R being Relation holds
( R is real-functions-valued iff rng R is real-functions-membered );

:: deftheorem Def23 defines rational-functions-valued VALUED_2:def 23 :
for R being Relation holds
( R is rational-functions-valued iff rng R is rational-functions-membered );

:: deftheorem Def24 defines integer-functions-valued VALUED_2:def 24 :
for R being Relation holds
( R is integer-functions-valued iff rng R is integer-functions-membered );

:: deftheorem Def25 defines natural-functions-valued VALUED_2:def 25 :
for R being Relation holds
( R is natural-functions-valued iff rng R is natural-functions-membered );

definition
let f be Function;
redefine attr f is complex-functions-valued means :: VALUED_2:def 26
for x being set st x in dom f holds
f . x is complex-valued Function;
compatibility
( f is complex-functions-valued iff for x being set st x in dom f holds
f . x is complex-valued Function )
proof end;
redefine attr f is ext-real-functions-valued means :: VALUED_2:def 27
for x being set st x in dom f holds
f . x is ext-real-valued Function;
compatibility
( f is ext-real-functions-valued iff for x being set st x in dom f holds
f . x is ext-real-valued Function )
proof end;
redefine attr f is real-functions-valued means :: VALUED_2:def 28
for x being set st x in dom f holds
f . x is real-valued Function;
compatibility
( f is real-functions-valued iff for x being set st x in dom f holds
f . x is real-valued Function )
proof end;
redefine attr f is rational-functions-valued means :: VALUED_2:def 29
for x being set st x in dom f holds
f . x is rational-valued Function;
compatibility
( f is rational-functions-valued iff for x being set st x in dom f holds
f . x is rational-valued Function )
proof end;
redefine attr f is integer-functions-valued means :: VALUED_2:def 30
for x being set st x in dom f holds
f . x is integer-valued Function;
compatibility
( f is integer-functions-valued iff for x being set st x in dom f holds
f . x is integer-valued Function )
proof end;
redefine attr f is natural-functions-valued means :: VALUED_2:def 31
for x being set st x in dom f holds
f . x is natural-valued Function;
compatibility
( f is natural-functions-valued iff for x being set st x in dom f holds
f . x is natural-valued Function )
proof end;
end;

:: deftheorem defines complex-functions-valued VALUED_2:def 26 :
for f being Function holds
( f is complex-functions-valued iff for x being set st x in dom f holds
f . x is complex-valued Function );

:: deftheorem defines ext-real-functions-valued VALUED_2:def 27 :
for f being Function holds
( f is ext-real-functions-valued iff for x being set st x in dom f holds
f . x is ext-real-valued Function );

:: deftheorem defines real-functions-valued VALUED_2:def 28 :
for f being Function holds
( f is real-functions-valued iff for x being set st x in dom f holds
f . x is real-valued Function );

:: deftheorem defines rational-functions-valued VALUED_2:def 29 :
for f being Function holds
( f is rational-functions-valued iff for x being set st x in dom f holds
f . x is rational-valued Function );

:: deftheorem defines integer-functions-valued VALUED_2:def 30 :
for f being Function holds
( f is integer-functions-valued iff for x being set st x in dom f holds
f . x is integer-valued Function );

:: deftheorem defines natural-functions-valued VALUED_2:def 31 :
for f being Function holds
( f is natural-functions-valued iff for x being set st x in dom f holds
f . x is natural-valued Function );

registration
cluster Relation-like natural-functions-valued -> integer-functions-valued set ;
coherence
for b1 being Relation st b1 is natural-functions-valued holds
b1 is integer-functions-valued
proof end;
cluster Relation-like integer-functions-valued -> rational-functions-valued set ;
coherence
for b1 being Relation st b1 is integer-functions-valued holds
b1 is rational-functions-valued
proof end;
cluster Relation-like rational-functions-valued -> real-functions-valued set ;
coherence
for b1 being Relation st b1 is rational-functions-valued holds
b1 is real-functions-valued
proof end;
cluster Relation-like real-functions-valued -> ext-real-functions-valued set ;
coherence
for b1 being Relation st b1 is real-functions-valued holds
b1 is ext-real-functions-valued
proof end;
cluster Relation-like real-functions-valued -> complex-functions-valued set ;
coherence
for b1 being Relation st b1 is real-functions-valued holds
b1 is complex-functions-valued
proof end;
end;

registration
cluster Relation-like empty -> natural-functions-valued set ;
coherence
for b1 being Relation st b1 is empty holds
b1 is natural-functions-valued
proof end;
end;

registration
cluster Relation-like Function-like natural-functions-valued set ;
existence
ex b1 being Function st b1 is natural-functions-valued
proof end;
end;

registration
let R be complex-functions-valued Relation;
cluster proj2 R -> complex-functions-membered ;
coherence
rng R is complex-functions-membered
by Def20;
end;

registration
let R be ext-real-functions-valued Relation;
cluster proj2 R -> ext-real-functions-membered ;
coherence
rng R is ext-real-functions-membered
by Def21;
end;

registration
let R be real-functions-valued Relation;
cluster proj2 R -> real-functions-membered ;
coherence
rng R is real-functions-membered
by Def22;
end;

registration
let R be rational-functions-valued Relation;
cluster proj2 R -> rational-functions-membered ;
coherence
rng R is rational-functions-membered
by Def23;
end;

registration
let R be integer-functions-valued Relation;
cluster proj2 R -> integer-functions-membered ;
coherence
rng R is integer-functions-membered
by Def24;
end;

registration
let R be natural-functions-valued Relation;
cluster proj2 R -> natural-functions-membered ;
coherence
rng R is natural-functions-membered
by Def25;
end;

registration
let X be set ;
let Y be complex-functions-membered set ;
cluster Function-like -> complex-functions-valued Element of K21(K22(X,Y));
coherence
for b1 being PartFunc of X,Y holds b1 is complex-functions-valued
proof end;
end;

registration
let X be set ;
let Y be ext-real-functions-membered set ;
cluster Function-like -> ext-real-functions-valued Element of K21(K22(X,Y));
coherence
for b1 being PartFunc of X,Y holds b1 is ext-real-functions-valued
proof end;
end;

registration
let X be set ;
let Y be real-functions-membered set ;
cluster Function-like -> real-functions-valued Element of K21(K22(X,Y));
coherence
for b1 being PartFunc of X,Y holds b1 is real-functions-valued
proof end;
end;

registration
let X be set ;
let Y be rational-functions-membered set ;
cluster Function-like -> rational-functions-valued Element of K21(K22(X,Y));
coherence
for b1 being PartFunc of X,Y holds b1 is rational-functions-valued
proof end;
end;

registration
let X be set ;
let Y be integer-functions-membered set ;
cluster Function-like -> integer-functions-valued Element of K21(K22(X,Y));
coherence
for b1 being PartFunc of X,Y holds b1 is integer-functions-valued
proof end;
end;

registration
let X be set ;
let Y be natural-functions-membered set ;
cluster Function-like -> natural-functions-valued Element of K21(K22(X,Y));
coherence
for b1 being PartFunc of X,Y holds b1 is natural-functions-valued
proof end;
end;

registration
let f be complex-functions-valued Function;
let x be set ;
cluster f . x -> Relation-like Function-like ;
coherence
( f . x is Function-like & f . x is Relation-like )
proof end;
end;

registration
let f be ext-real-functions-valued Function;
let x be set ;
cluster f . x -> Relation-like Function-like ;
coherence
( f . x is Function-like & f . x is Relation-like )
proof end;
end;

registration
let f be complex-functions-valued Function;
let x be set ;
cluster f . x -> complex-valued ;
coherence
f . x is complex-valued
proof end;
end;

registration
let f be ext-real-functions-valued Function;
let x be set ;
cluster f . x -> ext-real-valued ;
coherence
f . x is ext-real-valued
proof end;
end;

registration
let f be real-functions-valued Function;
let x be set ;
cluster f . x -> real-valued ;
coherence
f . x is real-valued
proof end;
end;

registration
let f be rational-functions-valued Function;
let x be set ;
cluster f . x -> rational-valued ;
coherence
f . x is rational-valued
proof end;
end;

registration
let f be integer-functions-valued Function;
let x be set ;
cluster f . x -> integer-valued ;
coherence
f . x is integer-valued
proof end;
end;

registration
let f be natural-functions-valued Function;
let x be set ;
cluster f . x -> natural-valued ;
coherence
f . x is natural-valued
proof end;
end;

begin

theorem Th7: :: VALUED_2:7
for c1, c2 being complex number
for g being complex-valued Function st g <> {} & g + c1 = g + c2 holds
c1 = c2
proof end;

theorem Th8: :: VALUED_2:8
for c1, c2 being complex number
for g being complex-valued Function st g <> {} & g - c1 = g - c2 holds
c1 = c2
proof end;

theorem Th9: :: VALUED_2:9
for c1, c2 being complex number
for g being complex-valued Function st g <> {} & g is non-empty & g (#) c1 = g (#) c2 holds
c1 = c2
proof end;

theorem Th10: :: VALUED_2:10
for c being complex number
for g being complex-valued Function holds - (g + c) = (- g) - c
proof end;

theorem Th11: :: VALUED_2:11
for c being complex number
for g being complex-valued Function holds - (g - c) = (- g) + c
proof end;

theorem Th12: :: VALUED_2:12
for c1, c2 being complex number
for g being complex-valued Function holds (g + c1) + c2 = g + (c1 + c2)
proof end;

theorem Th13: :: VALUED_2:13
for c1, c2 being complex number
for g being complex-valued Function holds (g + c1) - c2 = g + (c1 - c2)
proof end;

theorem Th14: :: VALUED_2:14
for c1, c2 being complex number
for g being complex-valued Function holds (g - c1) + c2 = g - (c1 - c2)
proof end;

theorem Th15: :: VALUED_2:15
for c1, c2 being complex number
for g being complex-valued Function holds (g - c1) - c2 = g - (c1 + c2)
proof end;

theorem Th16: :: VALUED_2:16
for c1, c2 being complex number
for g being complex-valued Function holds (g (#) c1) (#) c2 = g (#) (c1 * c2)
proof end;

theorem Th17: :: VALUED_2:17
for g, h being complex-valued Function holds - (g + h) = (- g) - h
proof end;

theorem Th18: :: VALUED_2:18
for g, h being complex-valued Function holds g - h = - (h - g)
proof end;

theorem Th19: :: VALUED_2:19
for g, h, k being complex-valued Function holds (g (#) h) /" k = g (#) (h /" k)
proof end;

theorem Th20: :: VALUED_2:20
for g, h, k being complex-valued Function holds (g /" h) (#) k = (g (#) k) /" h
proof end;

theorem Th21: :: VALUED_2:21
for g, h, k being complex-valued Function holds (g /" h) /" k = g /" (h (#) k)
proof end;

theorem Th22: :: VALUED_2:22
for c being complex number
for g being complex-valued Function holds c (#) (- g) = (- c) (#) g
proof end;

theorem Th23: :: VALUED_2:23
for c being complex number
for g being complex-valued Function holds c (#) (- g) = - (c (#) g)
proof end;

theorem Th24: :: VALUED_2:24
for c being complex number
for g being complex-valued Function holds (- c) (#) g = - (c (#) g)
proof end;

theorem Th25: :: VALUED_2:25
for g, h being complex-valued Function holds - (g (#) h) = (- g) (#) h
proof end;

theorem :: VALUED_2:26
for g, h being complex-valued Function holds - (g /" h) = (- g) /" h
proof end;

theorem Th27: :: VALUED_2:27
for g, h being complex-valued Function holds - (g /" h) = g /" (- h)
proof end;

definition
let f be complex-valued Function;
let c be complex number ;
func f (/) c -> Function equals :: VALUED_2:def 32
(1 / c) (#) f;
coherence
(1 / c) (#) f is Function
;
end;

:: deftheorem defines (/) VALUED_2:def 32 :
for f being complex-valued Function
for c being complex number holds f (/) c = (1 / c) (#) f;

registration
let f be complex-valued Function;
let c be complex number ;
cluster f (/) c -> complex-valued ;
coherence
f (/) c is complex-valued
;
end;

registration
let f be real-valued Function;
let r be real number ;
cluster f (/) r -> real-valued ;
coherence
f (/) r is real-valued
;
end;

registration
let f be rational-valued Function;
let r be rational number ;
cluster f (/) r -> rational-valued ;
coherence
f (/) r is rational-valued
;
end;

registration
let f be complex-valued FinSequence;
let c be complex number ;
cluster f (/) c -> FinSequence-like ;
coherence
f (/) c is FinSequence-like
;
end;

theorem :: VALUED_2:28
for c being complex number
for g being complex-valued Function holds dom (g (/) c) = dom g by VALUED_1:def 5;

theorem :: VALUED_2:29
for x being set
for c being complex number
for g being complex-valued Function holds (g (/) c) . x = (g . x) / c by VALUED_1:6;

theorem Th30: :: VALUED_2:30
for c being complex number
for g being complex-valued Function holds (- g) (/) c = - (g (/) c)
proof end;

theorem Th31: :: VALUED_2:31
for c being complex number
for g being complex-valued Function holds g (/) (- c) = - (g (/) c)
proof end;

theorem :: VALUED_2:32
for c being complex number
for g being complex-valued Function holds g (/) (- c) = (- g) (/) c
proof end;

theorem Th33: :: VALUED_2:33
for c1, c2 being complex number
for g being complex-valued Function st g <> {} & g is non-empty & g (/) c1 = g (/) c2 holds
c1 = c2
proof end;

theorem :: VALUED_2:34
for c1, c2 being complex number
for g being complex-valued Function holds (g (#) c1) (/) c2 = g (#) (c1 / c2)
proof end;

theorem :: VALUED_2:35
for c1, c2 being complex number
for g being complex-valued Function holds (g (/) c1) (#) c2 = (g (#) c2) (/) c1
proof end;

theorem :: VALUED_2:36
for c1, c2 being complex number
for g being complex-valued Function holds (g (/) c1) (/) c2 = g (/) (c1 * c2)
proof end;

theorem :: VALUED_2:37
for c being complex number
for g, h being complex-valued Function holds (g + h) (/) c = (g (/) c) + (h (/) c)
proof end;

theorem :: VALUED_2:38
for c being complex number
for g, h being complex-valued Function holds (g - h) (/) c = (g (/) c) - (h (/) c)
proof end;

theorem :: VALUED_2:39
for c being complex number
for g, h being complex-valued Function holds (g (#) h) (/) c = g (#) (h (/) c)
proof end;

theorem :: VALUED_2:40
for c being complex number
for g, h being complex-valued Function holds (g /" h) (/) c = g /" (h (#) c)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
deffunc H1( set ) -> set = - (f . $1);
func <-> f -> Function means :Def33: :: VALUED_2:def 33
( dom it = dom f & ( for x being set st x in dom it holds
it . x = - (f . x) ) );
existence
ex b1 being Function st
( dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = - (f . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = - (f . x) ) & dom b2 = dom f & ( for x being set st x in dom b2 holds
b2 . x = - (f . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def33 defines <-> VALUED_2:def 33 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for b4 being Function holds
( b4 = <-> f iff ( dom b4 = dom f & ( for x being set st x in dom b4 holds
b4 . x = - (f . x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
:: original: <->
redefine func <-> f -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
<-> f is PartFunc of X,(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
:: original: <->
redefine func <-> f -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
<-> f is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
:: original: <->
redefine func <-> f -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
<-> f is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
:: original: <->
redefine func <-> f -> PartFunc of X,(I_PFuncs (DOMS Y));
coherence
<-> f is PartFunc of X,(I_PFuncs (DOMS Y))
proof end;
end;

registration
let Y be complex-functions-membered set ;
let f be FinSequence of Y;
cluster <-> f -> FinSequence-like ;
coherence
<-> f is FinSequence-like
proof end;
end;

theorem :: VALUED_2:41
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y holds <-> (<-> f) = f
proof end;

theorem :: VALUED_2:42
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 st <-> f1 = <-> f2 holds
f1 = f2
proof end;

definition
let X be complex-functions-membered set ;
let Y be set ;
let f be PartFunc of X,Y;
defpred S1[ set , set ] means ex a being complex-valued Function st
( $1 = a & $2 = f . (- a) );
func f (-) -> Function means :: VALUED_2:def 34
( dom it = dom f & ( for x being complex-valued Function st x in dom it holds
it . x = f . (- x) ) );
existence
ex b1 being Function st
( dom b1 = dom f & ( for x being complex-valued Function st x in dom b1 holds
b1 . x = f . (- x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = dom f & ( for x being complex-valued Function st x in dom b1 holds
b1 . x = f . (- x) ) & dom b2 = dom f & ( for x being complex-valued Function st x in dom b2 holds
b2 . x = f . (- x) ) holds
b1 = b2
proof end;
end;

:: deftheorem defines (-) VALUED_2:def 34 :
for X being complex-functions-membered set
for Y being set
for f being PartFunc of X,Y
for b4 being Function holds
( b4 = f (-) iff ( dom b4 = dom f & ( for x being complex-valued Function st x in dom b4 holds
b4 . x = f . (- x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
deffunc H1( set ) -> set = (f . $1) " ;
func </> f -> Function means :Def35: :: VALUED_2:def 35
( dom it = dom f & ( for x being set st x in dom it holds
it . x = (f . x) " ) );
existence
ex b1 being Function st
( dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = (f . x) " ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = (f . x) " ) & dom b2 = dom f & ( for x being set st x in dom b2 holds
b2 . x = (f . x) " ) holds
b1 = b2
proof end;
end;

:: deftheorem Def35 defines </> VALUED_2:def 35 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for b4 being Function holds
( b4 = </> f iff ( dom b4 = dom f & ( for x being set st x in dom b4 holds
b4 . x = (f . x) " ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
:: original: </>
redefine func </> f -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
</> f is PartFunc of X,(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
:: original: </>
redefine func </> f -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
</> f is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
:: original: </>
redefine func </> f -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
</> f is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

registration
let Y be complex-functions-membered set ;
let f be FinSequence of Y;
cluster </> f -> FinSequence-like ;
coherence
</> f is FinSequence-like
proof end;
end;

theorem :: VALUED_2:43
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y holds </> (</> f) = f
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
deffunc H1( set ) -> set = abs (f . $1);
func abs f -> Function means :Def36: :: VALUED_2:def 36
( dom it = dom f & ( for x being set st x in dom it holds
it . x = abs (f . x) ) );
existence
ex b1 being Function st
( dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = abs (f . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = abs (f . x) ) & dom b2 = dom f & ( for x being set st x in dom b2 holds
b2 . x = abs (f . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def36 defines abs VALUED_2:def 36 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for b4 being Function holds
( b4 = abs f iff ( dom b4 = dom f & ( for x being set st x in dom b4 holds
b4 . x = abs (f . x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
:: original: abs
redefine func abs f -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
abs f is PartFunc of X,(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
:: original: abs
redefine func abs f -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
abs f is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
:: original: abs
redefine func abs f -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
abs f is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
:: original: abs
redefine func abs f -> PartFunc of X,(N_PFuncs (DOMS Y));
coherence
abs f is PartFunc of X,(N_PFuncs (DOMS Y))
proof end;
end;

registration
let Y be complex-functions-membered set ;
let f be FinSequence of Y;
cluster abs f -> FinSequence-like ;
coherence
abs f is FinSequence-like
proof end;
end;

theorem :: VALUED_2:44
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y holds abs (abs f) = abs f
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
deffunc H1( set ) -> set = c + (f . $1);
func f [+] c -> Function means :Def37: :: VALUED_2:def 37
( dom it = dom f & ( for x being set st x in dom it holds
it . x = c + (f . x) ) );
existence
ex b1 being Function st
( dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = c + (f . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = c + (f . x) ) & dom b2 = dom f & ( for x being set st x in dom b2 holds
b2 . x = c + (f . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def37 defines [+] VALUED_2:def 37 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for c being complex number
for b5 being Function holds
( b5 = f [+] c iff ( dom b5 = dom f & ( for x being set st x in dom b5 holds
b5 . x = c + (f . x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
:: original: [+]
redefine func f [+] c -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
f [+] c is PartFunc of X,(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let c be real number ;
:: original: [+]
redefine func f [+] c -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
f [+] c is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let c be rational number ;
:: original: [+]
redefine func f [+] c -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
f [+] c is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
let c be integer number ;
:: original: [+]
redefine func f [+] c -> PartFunc of X,(I_PFuncs (DOMS Y));
coherence
f [+] c is PartFunc of X,(I_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be natural-functions-membered set ;
let f be PartFunc of X,Y;
let c be natural number ;
:: original: [+]
redefine func f [+] c -> PartFunc of X,(N_PFuncs (DOMS Y));
coherence
f [+] c is PartFunc of X,(N_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:45
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y holds (f [+] c1) [+] c2 = f [+] (c1 + c2)
proof end;

theorem :: VALUED_2:46
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y st f <> {} & f is non-empty & f [+] c1 = f [+] c2 holds
c1 = c2
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
func f [-] c -> Function equals :: VALUED_2:def 38
f [+] (- c);
coherence
f [+] (- c) is Function
;
end;

:: deftheorem defines [-] VALUED_2:def 38 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for c being complex number holds f [-] c = f [+] (- c);

theorem :: VALUED_2:47
for X being set
for Y being complex-functions-membered set
for c being complex number
for f being PartFunc of X,Y holds dom (f [-] c) = dom f by Def37;

theorem :: VALUED_2:48
for X, x being set
for Y being complex-functions-membered set
for c being complex number
for f being PartFunc of X,Y st x in dom (f [-] c) holds
(f [-] c) . x = (f . x) - c by Def37;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
:: original: [-]
redefine func f [-] c -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
f [-] c is PartFunc of X,(C_PFuncs (DOMS Y))
;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let c be real number ;
:: original: [-]
redefine func f [-] c -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
f [-] c is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let c be rational number ;
:: original: [-]
redefine func f [-] c -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
f [-] c is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
let c be integer number ;
:: original: [-]
redefine func f [-] c -> PartFunc of X,(I_PFuncs (DOMS Y));
coherence
f [-] c is PartFunc of X,(I_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:49
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y st f <> {} & f is non-empty & f [-] c1 = f [-] c2 holds
c1 = c2
proof end;

theorem :: VALUED_2:50
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y holds (f [+] c1) [-] c2 = f [+] (c1 - c2)
proof end;

theorem :: VALUED_2:51
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y holds (f [-] c1) [+] c2 = f [-] (c1 - c2)
proof end;

theorem :: VALUED_2:52
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y holds (f [-] c1) [-] c2 = f [-] (c1 + c2)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
deffunc H1( set ) -> set = c (#) (f . $1);
func f [#] c -> Function means :Def39: :: VALUED_2:def 39
( dom it = dom f & ( for x being set st x in dom it holds
it . x = c (#) (f . x) ) );
existence
ex b1 being Function st
( dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = c (#) (f . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = dom f & ( for x being set st x in dom b1 holds
b1 . x = c (#) (f . x) ) & dom b2 = dom f & ( for x being set st x in dom b2 holds
b2 . x = c (#) (f . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def39 defines [#] VALUED_2:def 39 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for c being complex number
for b5 being Function holds
( b5 = f [#] c iff ( dom b5 = dom f & ( for x being set st x in dom b5 holds
b5 . x = c (#) (f . x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
:: original: [#]
redefine func f [#] c -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
f [#] c is PartFunc of X,(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let c be real number ;
:: original: [#]
redefine func f [#] c -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
f [#] c is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let c be rational number ;
:: original: [#]
redefine func f [#] c -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
f [#] c is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
let c be integer number ;
:: original: [#]
redefine func f [#] c -> PartFunc of X,(I_PFuncs (DOMS Y));
coherence
f [#] c is PartFunc of X,(I_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be natural-functions-membered set ;
let f be PartFunc of X,Y;
let c be natural number ;
:: original: [#]
redefine func f [#] c -> PartFunc of X,(N_PFuncs (DOMS Y));
coherence
f [#] c is PartFunc of X,(N_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:53
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y holds (f [#] c1) [#] c2 = f [#] (c1 * c2)
proof end;

theorem :: VALUED_2:54
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y st f <> {} & f is non-empty & ( for x being set st x in dom f holds
f . x is non-empty ) & f [#] c1 = f [#] c2 holds
c1 = c2
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
func f [/] c -> Function equals :: VALUED_2:def 40
f [#] (c ");
coherence
f [#] (c ") is Function
;
end;

:: deftheorem defines [/] VALUED_2:def 40 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for c being complex number holds f [/] c = f [#] (c ");

theorem :: VALUED_2:55
for X being set
for Y being complex-functions-membered set
for c being complex number
for f being PartFunc of X,Y holds dom (f [/] c) = dom f by Def39;

theorem :: VALUED_2:56
for X, x being set
for Y being complex-functions-membered set
for c being complex number
for f being PartFunc of X,Y st x in dom (f [/] c) holds
(f [/] c) . x = (c ") (#) (f . x) by Def39;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let c be complex number ;
:: original: [/]
redefine func f [/] c -> PartFunc of X,(C_PFuncs (DOMS Y));
coherence
f [/] c is PartFunc of X,(C_PFuncs (DOMS Y))
;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let c be real number ;
:: original: [/]
redefine func f [/] c -> PartFunc of X,(R_PFuncs (DOMS Y));
coherence
f [/] c is PartFunc of X,(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let c be rational number ;
:: original: [/]
redefine func f [/] c -> PartFunc of X,(Q_PFuncs (DOMS Y));
coherence
f [/] c is PartFunc of X,(Q_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:57
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y holds (f [/] c1) [/] c2 = f [/] (c1 * c2)
proof end;

theorem :: VALUED_2:58
for X being set
for Y being complex-functions-membered set
for c1, c2 being complex number
for f being PartFunc of X,Y st f <> {} & f is non-empty & ( for x being set st x in dom f holds
f . x is non-empty ) & f [/] c1 = f [/] c2 holds
c1 = c2
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
deffunc H1( set ) -> set = (f . $1) + (g . $1);
func f <+> g -> Function means :Def41: :: VALUED_2:def 41
( dom it = (dom f) /\ (dom g) & ( for x being set st x in dom it holds
it . x = (f . x) + (g . x) ) );
existence
ex b1 being Function st
( dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) + (g . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) + (g . x) ) & dom b2 = (dom f) /\ (dom g) & ( for x being set st x in dom b2 holds
b2 . x = (f . x) + (g . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def41 defines <+> VALUED_2:def 41 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function
for b5 being Function holds
( b5 = f <+> g iff ( dom b5 = (dom f) /\ (dom g) & ( for x being set st x in dom b5 holds
b5 . x = (f . x) + (g . x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
:: original: <+>
redefine func f <+> g -> PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y));
coherence
f <+> g is PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let g be real-valued Function;
:: original: <+>
redefine func f <+> g -> PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y));
coherence
f <+> g is PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let g be rational-valued Function;
:: original: <+>
redefine func f <+> g -> PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y));
coherence
f <+> g is PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
let g be integer-valued Function;
:: original: <+>
redefine func f <+> g -> PartFunc of (X /\ (dom g)),(I_PFuncs (DOMS Y));
coherence
f <+> g is PartFunc of (X /\ (dom g)),(I_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be natural-functions-membered set ;
let f be PartFunc of X,Y;
let g be natural-valued Function;
:: original: <+>
redefine func f <+> g -> PartFunc of (X /\ (dom g)),(N_PFuncs (DOMS Y));
coherence
f <+> g is PartFunc of (X /\ (dom g)),(N_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:59
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g, h being complex-valued Function holds (f <+> g) <+> h = f <+> (g + h)
proof end;

theorem :: VALUED_2:60
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds <-> (f <+> g) = (<-> f) <+> (- g)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
func f <-> g -> Function equals :: VALUED_2:def 42
f <+> (- g);
coherence
f <+> (- g) is Function
;
end;

:: deftheorem defines <-> VALUED_2:def 42 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds f <-> g = f <+> (- g);

theorem Th61: :: VALUED_2:61
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds dom (f <-> g) = (dom f) /\ (dom g)
proof end;

theorem Th62: :: VALUED_2:62
for X, x being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function st x in dom (f <-> g) holds
(f <-> g) . x = (f . x) - (g . x)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
:: original: <->
redefine func f <-> g -> PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y));
coherence
f <-> g is PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let g be real-valued Function;
:: original: <->
redefine func f <-> g -> PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y));
coherence
f <-> g is PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let g be rational-valued Function;
:: original: <->
redefine func f <-> g -> PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y));
coherence
f <-> g is PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
let g be integer-valued Function;
:: original: <->
redefine func f <-> g -> PartFunc of (X /\ (dom g)),(I_PFuncs (DOMS Y));
coherence
f <-> g is PartFunc of (X /\ (dom g)),(I_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:63
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds f <-> (- g) = f <+> g ;

theorem :: VALUED_2:64
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds <-> (f <-> g) = (<-> f) <+> g
proof end;

theorem :: VALUED_2:65
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g, h being complex-valued Function holds (f <+> g) <-> h = f <+> (g - h)
proof end;

theorem :: VALUED_2:66
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g, h being complex-valued Function holds (f <-> g) <+> h = f <-> (g - h)
proof end;

theorem :: VALUED_2:67
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g, h being complex-valued Function holds (f <-> g) <-> h = f <-> (g + h)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
deffunc H1( set ) -> set = (f . $1) (#) (g . $1);
func f <#> g -> Function means :Def43: :: VALUED_2:def 43
( dom it = (dom f) /\ (dom g) & ( for x being set st x in dom it holds
it . x = (f . x) (#) (g . x) ) );
existence
ex b1 being Function st
( dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) (#) (g . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) (#) (g . x) ) & dom b2 = (dom f) /\ (dom g) & ( for x being set st x in dom b2 holds
b2 . x = (f . x) (#) (g . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def43 defines <#> VALUED_2:def 43 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function
for b5 being Function holds
( b5 = f <#> g iff ( dom b5 = (dom f) /\ (dom g) & ( for x being set st x in dom b5 holds
b5 . x = (f . x) (#) (g . x) ) ) );

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
:: original: <#>
redefine func f <#> g -> PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y));
coherence
f <#> g is PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let g be real-valued Function;
:: original: <#>
redefine func f <#> g -> PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y));
coherence
f <#> g is PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let g be rational-valued Function;
:: original: <#>
redefine func f <#> g -> PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y));
coherence
f <#> g is PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be integer-functions-membered set ;
let f be PartFunc of X,Y;
let g be integer-valued Function;
:: original: <#>
redefine func f <#> g -> PartFunc of (X /\ (dom g)),(I_PFuncs (DOMS Y));
coherence
f <#> g is PartFunc of (X /\ (dom g)),(I_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be natural-functions-membered set ;
let f be PartFunc of X,Y;
let g be natural-valued Function;
:: original: <#>
redefine func f <#> g -> PartFunc of (X /\ (dom g)),(N_PFuncs (DOMS Y));
coherence
f <#> g is PartFunc of (X /\ (dom g)),(N_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:68
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds f <#> (- g) = (<-> f) <#> g
proof end;

theorem :: VALUED_2:69
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds f <#> (- g) = <-> (f <#> g)
proof end;

theorem :: VALUED_2:70
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g, h being complex-valued Function holds (f <#> g) <#> h = f <#> (g (#) h)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
func f </> g -> Function equals :: VALUED_2:def 44
f <#> (g ");
coherence
f <#> (g ") is Function
;
end;

:: deftheorem defines </> VALUED_2:def 44 :
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds f </> g = f <#> (g ");

theorem Th71: :: VALUED_2:71
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function holds dom (f </> g) = (dom f) /\ (dom g)
proof end;

theorem Th72: :: VALUED_2:72
for X, x being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g being complex-valued Function st x in dom (f </> g) holds
(f </> g) . x = (f . x) (/) (g . x)
proof end;

definition
let X be set ;
let Y be complex-functions-membered set ;
let f be PartFunc of X,Y;
let g be complex-valued Function;
:: original: </>
redefine func f </> g -> PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y));
coherence
f </> g is PartFunc of (X /\ (dom g)),(C_PFuncs (DOMS Y))
by VALUED_1:def 7;
end;

definition
let X be set ;
let Y be real-functions-membered set ;
let f be PartFunc of X,Y;
let g be real-valued Function;
:: original: </>
redefine func f </> g -> PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y));
coherence
f </> g is PartFunc of (X /\ (dom g)),(R_PFuncs (DOMS Y))
proof end;
end;

definition
let X be set ;
let Y be rational-functions-membered set ;
let f be PartFunc of X,Y;
let g be rational-valued Function;
:: original: </>
redefine func f </> g -> PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y));
coherence
f </> g is PartFunc of (X /\ (dom g)),(Q_PFuncs (DOMS Y))
proof end;
end;

theorem :: VALUED_2:73
for X being set
for Y being complex-functions-membered set
for f being PartFunc of X,Y
for g, h being complex-valued Function holds (f <#> g) </> h = f <#> (g /" h)
proof end;

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
deffunc H1( set ) -> set = (f . $1) + (g . $1);
func f <++> g -> Function means :Def45: :: VALUED_2:def 45
( dom it = (dom f) /\ (dom g) & ( for x being set st x in dom it holds
it . x = (f . x) + (g . x) ) );
existence
ex b1 being Function st
( dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) + (g . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) + (g . x) ) & dom b2 = (dom f) /\ (dom g) & ( for x being set st x in dom b2 holds
b2 . x = (f . x) + (g . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def45 defines <++> VALUED_2:def 45 :
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f being PartFunc of X1,Y1
for g being PartFunc of X2,Y2
for b7 being Function holds
( b7 = f <++> g iff ( dom b7 = (dom f) /\ (dom g) & ( for x being set st x in dom b7 holds
b7 . x = (f . x) + (g . x) ) ) );

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <++>
redefine func f <++> g -> PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <++> g is PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be real-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <++>
redefine func f <++> g -> PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <++> g is PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be rational-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <++>
redefine func f <++> g -> PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <++> g is PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be integer-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <++>
redefine func f <++> g -> PartFunc of (X1 /\ X2),(I_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <++> g is PartFunc of (X1 /\ X2),(I_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be natural-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <++>
redefine func f <++> g -> PartFunc of (X1 /\ X2),(N_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <++> g is PartFunc of (X1 /\ X2),(N_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

theorem :: VALUED_2:74
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f1 <++> f2 = f2 <++> f1
proof end;

theorem :: VALUED_2:75
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <++> f1) <++> f2 = f <++> (f1 <++> f2)
proof end;

theorem :: VALUED_2:76
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds <-> (f1 <++> f2) = (<-> f1) <++> (<-> f2)
proof end;

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
deffunc H1( set ) -> set = (f . $1) - (g . $1);
func f <--> g -> Function means :Def46: :: VALUED_2:def 46
( dom it = (dom f) /\ (dom g) & ( for x being set st x in dom it holds
it . x = (f . x) - (g . x) ) );
existence
ex b1 being Function st
( dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) - (g . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) - (g . x) ) & dom b2 = (dom f) /\ (dom g) & ( for x being set st x in dom b2 holds
b2 . x = (f . x) - (g . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def46 defines <--> VALUED_2:def 46 :
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f being PartFunc of X1,Y1
for g being PartFunc of X2,Y2
for b7 being Function holds
( b7 = f <--> g iff ( dom b7 = (dom f) /\ (dom g) & ( for x being set st x in dom b7 holds
b7 . x = (f . x) - (g . x) ) ) );

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <-->
redefine func f <--> g -> PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <--> g is PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be real-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <-->
redefine func f <--> g -> PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <--> g is PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be rational-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <-->
redefine func f <--> g -> PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <--> g is PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be integer-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <-->
redefine func f <--> g -> PartFunc of (X1 /\ X2),(I_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <--> g is PartFunc of (X1 /\ X2),(I_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

theorem :: VALUED_2:77
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f1 <--> f2 = <-> (f2 <--> f1)
proof end;

theorem :: VALUED_2:78
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds <-> (f1 <--> f2) = (<-> f1) <++> f2
proof end;

theorem :: VALUED_2:79
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <++> f1) <--> f2 = f <++> (f1 <--> f2)
proof end;

theorem :: VALUED_2:80
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <--> f1) <++> f2 = f <--> (f1 <--> f2)
proof end;

theorem :: VALUED_2:81
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <--> f1) <--> f2 = f <--> (f1 <++> f2)
proof end;

theorem :: VALUED_2:82
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <--> f1) <--> f2 = (f <--> f2) <--> f1
proof end;

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
deffunc H1( set ) -> set = (f . $1) (#) (g . $1);
func f <##> g -> Function means :Def47: :: VALUED_2:def 47
( dom it = (dom f) /\ (dom g) & ( for x being set st x in dom it holds
it . x = (f . x) (#) (g . x) ) );
existence
ex b1 being Function st
( dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) (#) (g . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) (#) (g . x) ) & dom b2 = (dom f) /\ (dom g) & ( for x being set st x in dom b2 holds
b2 . x = (f . x) (#) (g . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def47 defines <##> VALUED_2:def 47 :
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f being PartFunc of X1,Y1
for g being PartFunc of X2,Y2
for b7 being Function holds
( b7 = f <##> g iff ( dom b7 = (dom f) /\ (dom g) & ( for x being set st x in dom b7 holds
b7 . x = (f . x) (#) (g . x) ) ) );

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <##>
redefine func f <##> g -> PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <##> g is PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be real-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <##>
redefine func f <##> g -> PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <##> g is PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be rational-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <##>
redefine func f <##> g -> PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <##> g is PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be integer-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <##>
redefine func f <##> g -> PartFunc of (X1 /\ X2),(I_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <##> g is PartFunc of (X1 /\ X2),(I_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be natural-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <##>
redefine func f <##> g -> PartFunc of (X1 /\ X2),(N_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <##> g is PartFunc of (X1 /\ X2),(N_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

theorem Th83: :: VALUED_2:83
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f1 <##> f2 = f2 <##> f1
proof end;

theorem :: VALUED_2:84
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <##> f1) <##> f2 = f <##> (f1 <##> f2)
proof end;

theorem :: VALUED_2:85
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (<-> f1) <##> f2 = <-> (f1 <##> f2)
proof end;

theorem :: VALUED_2:86
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f1 <##> (<-> f2) = <-> (f1 <##> f2)
proof end;

theorem Th87: :: VALUED_2:87
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f <##> (f1 <++> f2) = (f <##> f1) <++> (f <##> f2)
proof end;

theorem :: VALUED_2:88
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f1 <++> f2) <##> f = (f1 <##> f) <++> (f2 <##> f)
proof end;

theorem Th89: :: VALUED_2:89
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f <##> (f1 <--> f2) = (f <##> f1) <--> (f <##> f2)
proof end;

theorem :: VALUED_2:90
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f1 <--> f2) <##> f = (f1 <##> f) <--> (f2 <##> f)
proof end;

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
deffunc H1( set ) -> set = (f . $1) /" (g . $1);
func f <//> g -> Function means :Def48: :: VALUED_2:def 48
( dom it = (dom f) /\ (dom g) & ( for x being set st x in dom it holds
it . x = (f . x) /" (g . x) ) );
existence
ex b1 being Function st
( dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) /" (g . x) ) )
proof end;
uniqueness
for b1, b2 being Function st dom b1 = (dom f) /\ (dom g) & ( for x being set st x in dom b1 holds
b1 . x = (f . x) /" (g . x) ) & dom b2 = (dom f) /\ (dom g) & ( for x being set st x in dom b2 holds
b2 . x = (f . x) /" (g . x) ) holds
b1 = b2
proof end;
end;

:: deftheorem Def48 defines <//> VALUED_2:def 48 :
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f being PartFunc of X1,Y1
for g being PartFunc of X2,Y2
for b7 being Function holds
( b7 = f <//> g iff ( dom b7 = (dom f) /\ (dom g) & ( for x being set st x in dom b7 holds
b7 . x = (f . x) /" (g . x) ) ) );

definition
let X1, X2 be set ;
let Y1, Y2 be complex-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <//>
redefine func f <//> g -> PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <//> g is PartFunc of (X1 /\ X2),(C_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be real-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <//>
redefine func f <//> g -> PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <//> g is PartFunc of (X1 /\ X2),(R_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

definition
let X1, X2 be set ;
let Y1, Y2 be rational-functions-membered set ;
let f be PartFunc of X1,Y1;
let g be PartFunc of X2,Y2;
:: original: <//>
redefine func f <//> g -> PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)));
coherence
f <//> g is PartFunc of (X1 /\ X2),(Q_PFuncs ((DOMS Y1) /\ (DOMS Y2)))
proof end;
end;

theorem :: VALUED_2:91
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (<-> f1) <//> f2 = <-> (f1 <//> f2)
proof end;

theorem :: VALUED_2:92
for X1, X2 being set
for Y1, Y2 being complex-functions-membered set
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds f1 <//> (<-> f2) = <-> (f1 <//> f2)
proof end;

theorem :: VALUED_2:93
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <##> f1) <//> f2 = f <##> (f1 <//> f2)
proof end;

theorem :: VALUED_2:94
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <//> f1) <##> f2 = (f <##> f2) <//> f1
proof end;

theorem :: VALUED_2:95
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f <//> f1) <//> f2 = f <//> (f1 <##> f2)
proof end;

theorem :: VALUED_2:96
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f1 <++> f2) <//> f = (f1 <//> f) <++> (f2 <//> f)
proof end;

theorem :: VALUED_2:97
for X, X1, X2 being set
for Y, Y1, Y2 being complex-functions-membered set
for f being PartFunc of X,Y
for f1 being PartFunc of X1,Y1
for f2 being PartFunc of X2,Y2 holds (f1 <--> f2) <//> f = (f1 <//> f) <--> (f2 <//> f)
proof end;