begin
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
pred f is_hpartial_differentiable`11_in u means :
Def3:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
x0 st
(
N c= dom (SVF1 1,(pdiff1 f,1),u) & ex
L being
LINEAR ex
R being
REST st
for
x being
Real st
x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) );
pred f is_hpartial_differentiable`12_in u means :
Def4:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
y0 st
(
N c= dom (SVF1 2,(pdiff1 f,1),u) & ex
L being
LINEAR ex
R being
REST st
for
y being
Real st
y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) );
pred f is_hpartial_differentiable`13_in u means :
Def4ForZ:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
z0 st
(
N c= dom (SVF1 3,(pdiff1 f,1),u) & ex
L being
LINEAR ex
R being
REST st
for
z being
Real st
z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) );
pred f is_hpartial_differentiable`21_in u means :
Def5:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
x0 st
(
N c= dom (SVF1 1,(pdiff1 f,2),u) & ex
L being
LINEAR ex
R being
REST st
for
x being
Real st
x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) );
pred f is_hpartial_differentiable`22_in u means :
Def6:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
y0 st
(
N c= dom (SVF1 2,(pdiff1 f,2),u) & ex
L being
LINEAR ex
R being
REST st
for
y being
Real st
y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) );
pred f is_hpartial_differentiable`23_in u means :
Def6ForZ:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
z0 st
(
N c= dom (SVF1 3,(pdiff1 f,2),u) & ex
L being
LINEAR ex
R being
REST st
for
z being
Real st
z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) );
pred f is_hpartial_differentiable`31_in u means :
Def5ForSecondOrder:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
x0 st
(
N c= dom (SVF1 1,(pdiff1 f,3),u) & ex
L being
LINEAR ex
R being
REST st
for
x being
Real st
x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) );
pred f is_hpartial_differentiable`32_in u means :
Def6ForSecondOrder:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
y0 st
(
N c= dom (SVF1 2,(pdiff1 f,3),u) & ex
L being
LINEAR ex
R being
REST st
for
y being
Real st
y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) );
pred f is_hpartial_differentiable`33_in u means :
Def6ForZForSecondOrder:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
z0 st
(
N c= dom (SVF1 3,(pdiff1 f,3),u) & ex
L being
LINEAR ex
R being
REST st
for
z being
Real st
z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) );
end;
:: deftheorem Def3 defines is_hpartial_differentiable`11_in PDIFF_5:def 1 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`11_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
for x being Real st x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) );
:: deftheorem Def4 defines is_hpartial_differentiable`12_in PDIFF_5:def 2 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`12_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
for y being Real st y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) );
:: deftheorem Def4ForZ defines is_hpartial_differentiable`13_in PDIFF_5:def 3 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`13_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
for z being Real st z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) );
:: deftheorem Def5 defines is_hpartial_differentiable`21_in PDIFF_5:def 4 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`21_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
for x being Real st x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) );
:: deftheorem Def6 defines is_hpartial_differentiable`22_in PDIFF_5:def 5 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`22_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
for y being Real st y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) );
:: deftheorem Def6ForZ defines is_hpartial_differentiable`23_in PDIFF_5:def 6 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`23_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
for z being Real st z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) );
:: deftheorem Def5ForSecondOrder defines is_hpartial_differentiable`31_in PDIFF_5:def 7 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`31_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
for x being Real st x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) );
:: deftheorem Def6ForSecondOrder defines is_hpartial_differentiable`32_in PDIFF_5:def 8 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`32_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
for y being Real st y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) );
:: deftheorem Def6ForZForSecondOrder defines is_hpartial_differentiable`33_in PDIFF_5:def 9 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 holds
( f is_hpartial_differentiable`33_in u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
for z being Real st z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`11_in u
;
func hpartdiff11 f,
u -> Real means :
Def7:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
x0 st
(
N c= dom (SVF1 1,(pdiff1 f,1),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
x being
Real st
x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def7 defines hpartdiff11 PDIFF_5:def 10 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`11_in u holds
for b3 being Real holds
( b3 = hpartdiff11 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,1),u) . x) - ((SVF1 1,(pdiff1 f,1),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`12_in u
;
func hpartdiff12 f,
u -> Real means :
Def8:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
y0 st
(
N c= dom (SVF1 2,(pdiff1 f,1),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
y being
Real st
y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def8 defines hpartdiff12 PDIFF_5:def 11 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`12_in u holds
for b3 being Real holds
( b3 = hpartdiff12 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,1),u) . y) - ((SVF1 2,(pdiff1 f,1),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`13_in u
;
func hpartdiff13 f,
u -> Real means :
Def8ForZ:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
z0 st
(
N c= dom (SVF1 3,(pdiff1 f,1),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
z being
Real st
z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def8ForZ defines hpartdiff13 PDIFF_5:def 12 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`13_in u holds
for b3 being Real holds
( b3 = hpartdiff13 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,1),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,1),u) . z) - ((SVF1 3,(pdiff1 f,1),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`21_in u
;
func hpartdiff21 f,
u -> Real means :
Def9:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
x0 st
(
N c= dom (SVF1 1,(pdiff1 f,2),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
x being
Real st
x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def9 defines hpartdiff21 PDIFF_5:def 13 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`21_in u holds
for b3 being Real holds
( b3 = hpartdiff21 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,2),u) . x) - ((SVF1 1,(pdiff1 f,2),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`22_in u
;
func hpartdiff22 f,
u -> Real means :
Def10:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
y0 st
(
N c= dom (SVF1 2,(pdiff1 f,2),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
y being
Real st
y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def10 defines hpartdiff22 PDIFF_5:def 14 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`22_in u holds
for b3 being Real holds
( b3 = hpartdiff22 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,2),u) . y) - ((SVF1 2,(pdiff1 f,2),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`23_in u
;
func hpartdiff23 f,
u -> Real means :
Def10ForZ:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
z0 st
(
N c= dom (SVF1 3,(pdiff1 f,2),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
z being
Real st
z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def10ForZ defines hpartdiff23 PDIFF_5:def 15 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`23_in u holds
for b3 being Real holds
( b3 = hpartdiff23 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,2),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,2),u) . z) - ((SVF1 3,(pdiff1 f,2),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`31_in u
;
func hpartdiff31 f,
u -> Real means :
Def9ForSecondOrder:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
x0 st
(
N c= dom (SVF1 1,(pdiff1 f,3),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
x being
Real st
x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def9ForSecondOrder defines hpartdiff31 PDIFF_5:def 16 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`31_in u holds
for b3 being Real holds
( b3 = hpartdiff31 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of x0 st
( N c= dom (SVF1 1,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for x being Real st x in N holds
((SVF1 1,(pdiff1 f,3),u) . x) - ((SVF1 1,(pdiff1 f,3),u) . x0) = (L . (x - x0)) + (R . (x - x0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`32_in u
;
func hpartdiff32 f,
u -> Real means :
Def10ForSecondOrder:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
y0 st
(
N c= dom (SVF1 2,(pdiff1 f,3),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
y being
Real st
y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def10ForSecondOrder defines hpartdiff32 PDIFF_5:def 17 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`32_in u holds
for b3 being Real holds
( b3 = hpartdiff32 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of y0 st
( N c= dom (SVF1 2,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for y being Real st y in N holds
((SVF1 2,(pdiff1 f,3),u) . y) - ((SVF1 2,(pdiff1 f,3),u) . y0) = (L . (y - y0)) + (R . (y - y0)) ) ) ) ) );
definition
let f be
PartFunc of
(REAL 3),
REAL ;
let u be
Element of
REAL 3;
assume A1:
f is_hpartial_differentiable`33_in u
;
func hpartdiff33 f,
u -> Real means :
Def10ForZForSecondOrder:
ex
x0,
y0,
z0 being
Real st
(
u = <*x0,y0,z0*> & ex
N being
Neighbourhood of
z0 st
(
N c= dom (SVF1 3,(pdiff1 f,3),u) & ex
L being
LINEAR ex
R being
REST st
(
it = L . 1 & ( for
z being
Real st
z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) );
existence
ex b1, x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) )
uniqueness
for b1, b2 being Real st ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b1 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) & ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b2 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) holds
b1 = b2
end;
:: deftheorem Def10ForZForSecondOrder defines hpartdiff33 PDIFF_5:def 18 :
for f being PartFunc of (REAL 3),REAL
for u being Element of REAL 3 st f is_hpartial_differentiable`33_in u holds
for b3 being Real holds
( b3 = hpartdiff33 f,u iff ex x0, y0, z0 being Real st
( u = <*x0,y0,z0*> & ex N being Neighbourhood of z0 st
( N c= dom (SVF1 3,(pdiff1 f,3),u) & ex L being LINEAR ex R being REST st
( b3 = L . 1 & ( for z being Real st z in N holds
((SVF1 3,(pdiff1 f,3),u) . z) - ((SVF1 3,(pdiff1 f,3),u) . z0) = (L . (z - z0)) + (R . (z - z0)) ) ) ) ) );
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem Th5:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`11_in u holds
hpartdiff11 f,
u = diff (SVF1 1,(pdiff1 f,1),u),
x0
theorem Th6:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`12_in u holds
hpartdiff12 f,
u = diff (SVF1 2,(pdiff1 f,1),u),
y0
theorem Th6ForZ:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`13_in u holds
hpartdiff13 f,
u = diff (SVF1 3,(pdiff1 f,1),u),
z0
theorem Th7:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`21_in u holds
hpartdiff21 f,
u = diff (SVF1 1,(pdiff1 f,2),u),
x0
theorem Th8:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`22_in u holds
hpartdiff22 f,
u = diff (SVF1 2,(pdiff1 f,2),u),
y0
theorem Th8ForZ:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`23_in u holds
hpartdiff23 f,
u = diff (SVF1 3,(pdiff1 f,2),u),
z0
theorem Th7ForSecondOrder:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`31_in u holds
hpartdiff31 f,
u = diff (SVF1 1,(pdiff1 f,3),u),
x0
theorem Th8ForSecondOrder:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`32_in u holds
hpartdiff32 f,
u = diff (SVF1 2,(pdiff1 f,3),u),
y0
theorem Th8ForZForSecondOrder:
for
x0,
y0,
z0 being
Real for
u being
Element of
REAL 3
for
f being
PartFunc of
(REAL 3),
REAL st
u = <*x0,y0,z0*> &
f is_hpartial_differentiable`33_in u holds
hpartdiff33 f,
u = diff (SVF1 3,(pdiff1 f,3),u),
z0
:: deftheorem Def11 defines is_hpartial_differentiable`11_on PDIFF_5:def 19 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`11_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`11_in u ) ) );
:: deftheorem Def12 defines is_hpartial_differentiable`12_on PDIFF_5:def 20 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`12_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`12_in u ) ) );
:: deftheorem Def12ForZ defines is_hpartial_differentiable`13_on PDIFF_5:def 21 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`13_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`13_in u ) ) );
:: deftheorem Def13 defines is_hpartial_differentiable`21_on PDIFF_5:def 22 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`21_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`21_in u ) ) );
:: deftheorem Def14 defines is_hpartial_differentiable`22_on PDIFF_5:def 23 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`22_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`22_in u ) ) );
:: deftheorem Def14ForZ defines is_hpartial_differentiable`23_on PDIFF_5:def 24 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`23_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`23_in u ) ) );
:: deftheorem Def13ForSecondOrder defines is_hpartial_differentiable`31_on PDIFF_5:def 25 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`31_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`31_in u ) ) );
:: deftheorem Def14ForSecondOrder defines is_hpartial_differentiable`32_on PDIFF_5:def 26 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`32_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`32_in u ) ) );
:: deftheorem Def14ForZForSecondOrder defines is_hpartial_differentiable`33_on PDIFF_5:def 27 :
for f being PartFunc of (REAL 3),REAL
for D being set holds
( f is_hpartial_differentiable`33_on D iff ( D c= dom f & ( for u being Element of REAL 3 st u in D holds
f | D is_hpartial_differentiable`33_in u ) ) );
:: deftheorem defines `hpartial11| PDIFF_5:def 28 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`11_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial11| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff11 f,u ) ) );
:: deftheorem defines `hpartial12| PDIFF_5:def 29 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`12_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial12| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff12 f,u ) ) );
:: deftheorem defines `hpartial13| PDIFF_5:def 30 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`13_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial13| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff13 f,u ) ) );
:: deftheorem defines `hpartial21| PDIFF_5:def 31 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`21_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial21| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff21 f,u ) ) );
:: deftheorem defines `hpartial22| PDIFF_5:def 32 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`22_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial22| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff22 f,u ) ) );
:: deftheorem defines `hpartial23| PDIFF_5:def 33 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`23_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial23| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff23 f,u ) ) );
:: deftheorem defines `hpartial31| PDIFF_5:def 34 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`31_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial31| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff31 f,u ) ) );
:: deftheorem defines `hpartial32| PDIFF_5:def 35 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`32_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial32| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff32 f,u ) ) );
:: deftheorem defines `hpartial33| PDIFF_5:def 36 :
for f being PartFunc of (REAL 3),REAL
for D being set st f is_hpartial_differentiable`33_on D holds
for b3 being PartFunc of (REAL 3),REAL holds
( b3 = f `hpartial33| D iff ( dom b3 = D & ( for u being Element of REAL 3 st u in D holds
b3 . u = hpartdiff33 f,u ) ) );
begin
theorem Th9:
theorem Th10:
theorem Th10ForZ:
theorem Th11:
theorem Th12:
theorem Th12ForZ:
theorem Th11ForSecondOrder:
theorem Th12ForSecondOrder:
theorem Th12ForZForSecondOrder:
theorem Th17:
theorem Th18:
theorem Th18ForZ:
theorem Th19:
theorem Th20:
theorem Th20ForZ:
theorem Th19ForSecondOrder:
theorem Th20ForSecondOrder:
theorem Th20ForZForSecondOrder:
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 1,3) . u0 st
f is_hpartial_differentiable`11_in u0 &
N c= dom (SVF1 1,(pdiff1 f,1),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 1,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 1,(pdiff1 f,1),u0) /* (h + c)) - ((SVF1 1,(pdiff1 f,1),u0) /* c)) is
convergent &
hpartdiff11 f,
u0 = lim ((h " ) (#) (((SVF1 1,(pdiff1 f,1),u0) /* (h + c)) - ((SVF1 1,(pdiff1 f,1),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 2,3) . u0 st
f is_hpartial_differentiable`12_in u0 &
N c= dom (SVF1 2,(pdiff1 f,1),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 2,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 2,(pdiff1 f,1),u0) /* (h + c)) - ((SVF1 2,(pdiff1 f,1),u0) /* c)) is
convergent &
hpartdiff12 f,
u0 = lim ((h " ) (#) (((SVF1 2,(pdiff1 f,1),u0) /* (h + c)) - ((SVF1 2,(pdiff1 f,1),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 3,3) . u0 st
f is_hpartial_differentiable`13_in u0 &
N c= dom (SVF1 3,(pdiff1 f,1),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 3,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 3,(pdiff1 f,1),u0) /* (h + c)) - ((SVF1 3,(pdiff1 f,1),u0) /* c)) is
convergent &
hpartdiff13 f,
u0 = lim ((h " ) (#) (((SVF1 3,(pdiff1 f,1),u0) /* (h + c)) - ((SVF1 3,(pdiff1 f,1),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 1,3) . u0 st
f is_hpartial_differentiable`21_in u0 &
N c= dom (SVF1 1,(pdiff1 f,2),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 1,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 1,(pdiff1 f,2),u0) /* (h + c)) - ((SVF1 1,(pdiff1 f,2),u0) /* c)) is
convergent &
hpartdiff21 f,
u0 = lim ((h " ) (#) (((SVF1 1,(pdiff1 f,2),u0) /* (h + c)) - ((SVF1 1,(pdiff1 f,2),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 2,3) . u0 st
f is_hpartial_differentiable`22_in u0 &
N c= dom (SVF1 2,(pdiff1 f,2),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 2,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 2,(pdiff1 f,2),u0) /* (h + c)) - ((SVF1 2,(pdiff1 f,2),u0) /* c)) is
convergent &
hpartdiff22 f,
u0 = lim ((h " ) (#) (((SVF1 2,(pdiff1 f,2),u0) /* (h + c)) - ((SVF1 2,(pdiff1 f,2),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 3,3) . u0 st
f is_hpartial_differentiable`23_in u0 &
N c= dom (SVF1 3,(pdiff1 f,2),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 3,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 3,(pdiff1 f,2),u0) /* (h + c)) - ((SVF1 3,(pdiff1 f,2),u0) /* c)) is
convergent &
hpartdiff23 f,
u0 = lim ((h " ) (#) (((SVF1 3,(pdiff1 f,2),u0) /* (h + c)) - ((SVF1 3,(pdiff1 f,2),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 1,3) . u0 st
f is_hpartial_differentiable`31_in u0 &
N c= dom (SVF1 1,(pdiff1 f,3),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 1,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 1,(pdiff1 f,3),u0) /* (h + c)) - ((SVF1 1,(pdiff1 f,3),u0) /* c)) is
convergent &
hpartdiff31 f,
u0 = lim ((h " ) (#) (((SVF1 1,(pdiff1 f,3),u0) /* (h + c)) - ((SVF1 1,(pdiff1 f,3),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 2,3) . u0 st
f is_hpartial_differentiable`32_in u0 &
N c= dom (SVF1 2,(pdiff1 f,3),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 2,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 2,(pdiff1 f,3),u0) /* (h + c)) - ((SVF1 2,(pdiff1 f,3),u0) /* c)) is
convergent &
hpartdiff32 f,
u0 = lim ((h " ) (#) (((SVF1 2,(pdiff1 f,3),u0) /* (h + c)) - ((SVF1 2,(pdiff1 f,3),u0) /* c))) )
theorem
for
f being
PartFunc of
(REAL 3),
REAL for
u0 being
Element of
REAL 3
for
N being
Neighbourhood of
(proj 3,3) . u0 st
f is_hpartial_differentiable`33_in u0 &
N c= dom (SVF1 3,(pdiff1 f,3),u0) holds
for
h being
convergent_to_0 Real_Sequence for
c being
V20()
Real_Sequence st
rng c = {((proj 3,3) . u0)} &
rng (h + c) c= N holds
(
(h " ) (#) (((SVF1 3,(pdiff1 f,3),u0) /* (h + c)) - ((SVF1 3,(pdiff1 f,3),u0) /* c)) is
convergent &
hpartdiff33 f,
u0 = lim ((h " ) (#) (((SVF1 3,(pdiff1 f,3),u0) /* (h + c)) - ((SVF1 3,(pdiff1 f,3),u0) /* c))) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`11_in u0 &
f2 is_hpartial_differentiable`11_in u0 holds
(
(pdiff1 f1,1) + (pdiff1 f2,1) is_partial_differentiable_in u0,1 &
partdiff ((pdiff1 f1,1) + (pdiff1 f2,1)),
u0,1
= (hpartdiff11 f1,u0) + (hpartdiff11 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`12_in u0 &
f2 is_hpartial_differentiable`12_in u0 holds
(
(pdiff1 f1,1) + (pdiff1 f2,1) is_partial_differentiable_in u0,2 &
partdiff ((pdiff1 f1,1) + (pdiff1 f2,1)),
u0,2
= (hpartdiff12 f1,u0) + (hpartdiff12 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`13_in u0 &
f2 is_hpartial_differentiable`13_in u0 holds
(
(pdiff1 f1,1) + (pdiff1 f2,1) is_partial_differentiable_in u0,3 &
partdiff ((pdiff1 f1,1) + (pdiff1 f2,1)),
u0,3
= (hpartdiff13 f1,u0) + (hpartdiff13 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`21_in u0 &
f2 is_hpartial_differentiable`21_in u0 holds
(
(pdiff1 f1,2) + (pdiff1 f2,2) is_partial_differentiable_in u0,1 &
partdiff ((pdiff1 f1,2) + (pdiff1 f2,2)),
u0,1
= (hpartdiff21 f1,u0) + (hpartdiff21 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`22_in u0 &
f2 is_hpartial_differentiable`22_in u0 holds
(
(pdiff1 f1,2) + (pdiff1 f2,2) is_partial_differentiable_in u0,2 &
partdiff ((pdiff1 f1,2) + (pdiff1 f2,2)),
u0,2
= (hpartdiff22 f1,u0) + (hpartdiff22 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`23_in u0 &
f2 is_hpartial_differentiable`23_in u0 holds
(
(pdiff1 f1,2) + (pdiff1 f2,2) is_partial_differentiable_in u0,3 &
partdiff ((pdiff1 f1,2) + (pdiff1 f2,2)),
u0,3
= (hpartdiff23 f1,u0) + (hpartdiff23 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`11_in u0 &
f2 is_hpartial_differentiable`11_in u0 holds
(
(pdiff1 f1,1) - (pdiff1 f2,1) is_partial_differentiable_in u0,1 &
partdiff ((pdiff1 f1,1) - (pdiff1 f2,1)),
u0,1
= (hpartdiff11 f1,u0) - (hpartdiff11 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`12_in u0 &
f2 is_hpartial_differentiable`12_in u0 holds
(
(pdiff1 f1,1) - (pdiff1 f2,1) is_partial_differentiable_in u0,2 &
partdiff ((pdiff1 f1,1) - (pdiff1 f2,1)),
u0,2
= (hpartdiff12 f1,u0) - (hpartdiff12 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`13_in u0 &
f2 is_hpartial_differentiable`13_in u0 holds
(
(pdiff1 f1,1) - (pdiff1 f2,1) is_partial_differentiable_in u0,3 &
partdiff ((pdiff1 f1,1) - (pdiff1 f2,1)),
u0,3
= (hpartdiff13 f1,u0) - (hpartdiff13 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`21_in u0 &
f2 is_hpartial_differentiable`21_in u0 holds
(
(pdiff1 f1,2) - (pdiff1 f2,2) is_partial_differentiable_in u0,1 &
partdiff ((pdiff1 f1,2) - (pdiff1 f2,2)),
u0,1
= (hpartdiff21 f1,u0) - (hpartdiff21 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`22_in u0 &
f2 is_hpartial_differentiable`22_in u0 holds
(
(pdiff1 f1,2) - (pdiff1 f2,2) is_partial_differentiable_in u0,2 &
partdiff ((pdiff1 f1,2) - (pdiff1 f2,2)),
u0,2
= (hpartdiff22 f1,u0) - (hpartdiff22 f2,u0) )
theorem
for
u0 being
Element of
REAL 3
for
f1,
f2 being
PartFunc of
(REAL 3),
REAL st
f1 is_hpartial_differentiable`23_in u0 &
f2 is_hpartial_differentiable`23_in u0 holds
(
(pdiff1 f1,2) - (pdiff1 f2,2) is_partial_differentiable_in u0,3 &
partdiff ((pdiff1 f1,2) - (pdiff1 f2,2)),
u0,3
= (hpartdiff23 f1,u0) - (hpartdiff23 f2,u0) )
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem
theorem