:: The Formalization of Decision Free {P}etri Net
:: by Pratima K. Shah , Pauline N. Kawamoto and Mariusz Giero
::
:: Received March 31, 2014
:: Copyright (c) 2014-2018 Association of Mizar Users
:: (Stowarzyszenie Uzytkownikow Mizara, Bialystok, Poland).
:: This code can be distributed under the GNU General Public Licence
:: version 3.0 or later, or the Creative Commons Attribution-ShareAlike
:: License version 3.0 or later, subject to the binding interpretation
:: detailed in file COPYING.interpretation.
:: See COPYING.GPL and COPYING.CC-BY-SA for the full text of these
:: licenses, or see http://www.gnu.org/licenses/gpl.html and
:: http://creativecommons.org/licenses/by-sa/3.0/.
environ
vocabularies PETRI_DF, NUMBERS, XBOOLE_0, FUNCT_1, SUBSET_1, RELAT_1, TARSKI,
PETRI, FUNCT_2, ARYTM_3, FINSEQ_1, PARTFUN1, XXREAL_0, CARD_1, CARD_3,
ORDINAL4, NAT_1, ARYTM_1, BOOLMARK, STRUCT_0, PNPROC_1, ZFMISC_1, INT_1,
FINSET_1, AOFA_I00, NET_1, FINSEQ_4, RFINSEQ, FINSEQ_6, JORDAN23;
notations TARSKI, XBOOLE_0, SUBSET_1, NUMBERS, XCMPLX_0, NAT_1, FUNCT_1,
PARTFUN1, FUNCT_2, DOMAIN_1, XXREAL_0, STRUCT_0, ZFMISC_1, RELSET_1,
FINSEQ_1, PARTIT_2, PETRI, FINSET_1, NAT_D, WSIERP_1, RLAFFIN3, NET_1,
FINSEQ_6, FINSEQ_4, JORDAN23, RFINSEQ;
constructors PARTIT_2, NAT_D, WSIERP_1, RLAFFIN3, NET_1, FINSEQ_4, FINSEQ_6,
RFINSEQ, JORDAN23;
registrations XXREAL_0, XREAL_0, FINSEQ_1, ORDINAL1, CARD_1, RELSET_1,
STRUCT_0, XBOOLE_0, SUBSET_1, XTUPLE_0, FINSET_1, NAT_1, MEMBERED,
VALUED_0, PETRI;
requirements REAL, NUMERALS, BOOLE, SUBSET, ARITHM;
definitions XBOOLE_0, TARSKI, JORDAN23;
equalities PETRI, NET_1;
expansions FINSEQ_6;
theorems TARSKI, ZFMISC_1, PETRI, FUNCT_1, FUNCT_2, FINSEQ_1, FINSEQ_4, NAT_1,
FINSEQ_2, FINSEQ_3, RELAT_1, XBOOLE_0, XREAL_1, XXREAL_0, PARTFUN1,
SEQ_4, NAT_D, RLAFFIN3, BOOLMARK, NET_1, RVSUM_1, FINSEQ_5, RFINSEQ,
JORDAN23;
schemes NAT_1, DOMAIN_1, FUNCT_2, FINSEQ_1, FRAENKEL;
begin :: Preliminaries
reserve N for PT_net_Str, PTN for Petri_net, i for Nat;
theorem Th10:
for x,y be Nat, f be FinSequence st
f/^1 is one-to-one & 1 < x & x <= len f & 1 < y & y <= len f & f.x = f.y
holds x = y
proof
let x,y be Nat, f be FinSequence;
assume
B1: f/^1 is one-to-one & 1 < x & x <= len f & 1 < y & y <= len f & f.x = f.y;
then
A68: 1 < len f by XXREAL_0:2;
reconsider xm1 = x - 1,ym1 = y - 1 as Element of NAT by NAT_1:21,B1;
B8: len (f/^1) = (len f) - 1 by RFINSEQ:def 1,A68;
B9: x + -1 <= len f + -1 by B1,XREAL_1:6;
1 < xm1 +1 by B1; then
1 <= xm1 & xm1 <= len (f/^1) by NAT_1:13,B9,B8; then
B4: xm1 in dom (f/^1) by FINSEQ_3:25;
B9a: y + -1 <= len f + -1 by B1,XREAL_1:6;
1 < ym1 +1 by B1;then
1 <= ym1 & ym1 <= len (f/^1) by NAT_1:13,B9a,B8; then
B5: ym1 in dom (f/^1) by FINSEQ_3:25;
(f/^1).xm1 = f.(xm1+1) by RFINSEQ:def 1,B4,A68
.= f.(ym1+1) by B1 .= (f/^1).ym1 by RFINSEQ:def 1,B5,A68;then
xm1 = ym1 by B1,FUNCT_1:def 4,B4,B5;
hence x = y;
end;
theorem Lm1:
for D be non empty set, f be non empty FinSequence of D
st f is circular holds f.1 = f.len f
proof
let D be non empty set, f be non empty FinSequence of D;
assume
A4: f is circular;
A2: 0+1 <= len f by NAT_1:13;then
A1: 1 in dom f by FINSEQ_3:25;
A3: len f in dom f by FINSEQ_3:25,A2;
thus f.1 = f/.1 by PARTFUN1:def 6,A1
.= f.len f by PARTFUN1:def 6,A3,A4;
end;
registration
let D be non empty set;
let a,b be Element of D;
cluster <*a,b,a*> -> circular for FinSequence of D;
coherence
proof
set f = <*a,b,a*>;
A8: len f = 3 by FINSEQ_1:45;
A1: f.3 = a by FINSEQ_1:45;
K1: 1 in dom f by A8,FINSEQ_3:25;
K2: len f in dom f by FINSEQ_3:25,A8;
f/.1 = f.1 by PARTFUN1:def 6,K1
.= f.len f by A8,FINSEQ_1:45,A1
.= f/.(len f) by PARTFUN1:def 6,K2;
hence thesis;
end;
end;
theorem Th13:
for a,b be object st a <> b holds <*a,b,a*> is almost-one-to-one
proof
let a,b be object;
assume
Z1: a <> b;
set f = <*a,b,a*>;
let i,j be Nat;
assume
Z2: i in dom f & j in dom f & (i <> 1 or j <> len f) & (i <> len f or j <> 1)
& f.i = f.j;
A8: len f = 3 by FINSEQ_1:45;then
A1: 1 <= i & i <= 3 by FINSEQ_3:25,Z2;
A1a: 1 <= j & j <= 3 by FINSEQ_3:25,Z2,A8;
A12: f.1 = a & f.2 = b & f.3 = a by FINSEQ_1:45;
1 = i or 1 < i by A1,XXREAL_0:1;then
1 = i or 1+1<=i by NAT_1:13;then
1 = i or 2=i or 2 < i by XXREAL_0:1;then
A2: 1 = i or 2=i or 2+1 <= i by NAT_1:13;
1 = j or 1 < j by A1a,XXREAL_0:1;then
1 = j or 1+1<=j by NAT_1:13;then
1 = j or 2=j or 2 < j by XXREAL_0:1;then
A3: 1 = j or 2=j or 2+1 <= j by NAT_1:13;then
per cases by A1a,XXREAL_0:1,A1, A2;
suppose (1 = i or 3 = i) & j <> 2;
hence i = j by A8,Z2,A3,XXREAL_0:1,A1a;
end;
suppose (1 = j or 3 = j) & i <> 2;
hence i = j by A8,Z2,XXREAL_0:1,A1, A2;
end;
suppose 1 = i & 2 = j or 2 = i & 1 = j or 2 = i & 2 = j or 2 = i & 3 = j
or 3 = i & 2 = j;
hence i = j by Z2,Z1,A12;
end;
end;
definition
let X be set;
let Y be non empty set;
let P be finite Subset of X;
let M0 be Function of X,Y;
mode Enumeration of M0, P -> FinSequence of Y means
:Def12:
len it = len the Enumeration of P &
for i st i in dom it holds
it.i = M0.((the Enumeration of P).i) if P is non empty
otherwise it = <*>Y;
existence
proof
ex p be FinSequence of Y st
len p = len the Enumeration of P &
for i st i in dom p holds p.i = M0.((the Enumeration of P).i)
proof
deffunc F(Nat) = M0.((the Enumeration of P).$1);
consider p being FinSequence such that
A1: len p = len the Enumeration of P &
for i be Nat st i in dom p holds p.i = F(i) from FINSEQ_1:sch 2;
rng p c= Y
proof
let y be object;
assume y in rng p; then
consider x be object such that
A2: x in dom p & y = p.x by FUNCT_1:def 3;
reconsider x as Element of NAT by A2;
A3: y = F(x) by A1,A2;
x in dom the Enumeration of P by A2, FINSEQ_3:29, A1; then
(the Enumeration of P).x in rng the Enumeration of P by FUNCT_1:3;
then (the Enumeration of P).x in P by RLAFFIN3:def 1;
hence y in Y by A3, FUNCT_2:5;
end; then
reconsider p as FinSequence of Y by FINSEQ_1:def 4;
take p;
thus thesis by A1;
end;
hence P is non empty implies ex p be FinSequence of Y st
len p = len the Enumeration of P &
for i st i in dom p holds p.i = M0.((the Enumeration of P).i);
thus P is empty implies ex p be FinSequence of Y st p = <*>Y;
end;
consistency;
end;
definition
func PetriNet -> Petri_net equals
PT_net_Str(# {0},{1},[#] ({0},{1}),[#] ({1},{0}) #);
coherence by PETRI:def 1, PETRI:def 2;
end;
notation
let N;
synonym places_and_trans_of N for Elements N;
end;
registration
let PTN;
cluster places_and_trans_of PTN -> non empty;
coherence;
end;
reserve fs for FinSequence of places_and_trans_of PTN;
definition
let PTN,fs;
func places_of fs -> finite Subset of PTN equals
{ p where p is place of PTN : p in rng fs };
coherence
proof
defpred P[set] means $1 in rng fs;
deffunc F(set) = $1;
A2: rng fs is finite;
A1: {F(p) where p is place of PTN : p in rng fs}
is finite from FRAENKEL:sch 21(A2);
{p where p is place of PTN : P[p]}
is Subset of the carrier of PTN from DOMAIN_1:sch 7;
hence thesis by A1;
end;
func transitions_of fs -> finite Subset of the carrier' of PTN equals
{t where t is transition of PTN : t in rng fs};
coherence
proof
defpred P[set] means $1 in rng fs;
deffunc F(set) = $1;
A2: rng fs is finite;
A1: {F(t) where t is transition of PTN : t in rng fs}
is finite from FRAENKEL:sch 21(A2);
{t where t is transition of PTN : P[t]}
is Subset of the carrier' of PTN from DOMAIN_1:sch 7;
hence thesis by A1;
end;
end;
begin :: The number of tokens in a circuit
:: Relation Between P and NAT
definition
let N;
func nat_marks_of N -> FUNCTION_DOMAIN of the carrier of N, NAT equals
Funcs(the carrier of N, NAT);
correctness;
end;
definition
let N;
mode marking of N is Element of nat_marks_of N;
end;
:: Generation of nat marking and summation of that
definition
let N;
let P be finite Subset of N;
let M0 be marking of N;
func num_marks(P, M0) -> Element of NAT equals
Sum (the Enumeration of M0,P);
coherence;
end;
begin
:: Decision-Free Petri Net Concept and Properties of Circuits in Petri Nets
definition
let IT be Petri_net;
attr IT is decision_free_like means :Def1:
for s being place of IT holds
((ex t being transition of IT st [t, s] in the T-S_Arcs of IT) &
(for t1, t2 being transition of IT
st [t1, s] in the T-S_Arcs of IT &
[t2, s] in the T-S_Arcs of IT holds t1 = t2)) &
((ex t being transition of IT st
[s, t] in the S-T_Arcs of IT) &
(for t1, t2 being transition of IT
st [s, t1] in the S-T_Arcs of IT &
[s, t2] in the S-T_Arcs of IT holds t1 = t2));
end;
:: directed_path_like Attribute for
:: FinSequence of places_and_trans_of Petri_net
definition
let PTN;
let IT be FinSequence of places_and_trans_of PTN;
attr IT is directed_path_like means
:Def5:
len IT >= 3 & len IT mod 2 = 1 &
(for i st i mod 2 = 1 & i + 1 < len IT holds
[IT.i, IT.(i+1)] in the S-T_Arcs of PTN &
[IT.(i+1),IT.(i+2)] in the T-S_Arcs of PTN)
& IT.len IT in the carrier of PTN;
end;
theorem Th12:
for fs be FinSequence of places_and_trans_of PetriNet st fs = <*0,1,0*>
holds fs is directed_path_like
proof
let fs be FinSequence of places_and_trans_of PetriNet;
assume
L1: fs = <*0,1,0*>;
A12: fs.1 = 0 & fs.2 = 1 & fs.3 = 0 by FINSEQ_1:45,L1;
set N = PetriNet;
thus fs is directed_path_like
proof
2 mod 2 = 0 by NAT_D:25;then
L3: 2 + 1 mod 2 = 1 by NAT_D:16;
L4: now
let i;
assume
A16: i mod 2 = 1 & i + 1 < len fs;
0 mod 2 = 0 by NAT_D:26;then
0 < i by A16;then
A17: 0+1 <= i by NAT_1:13;
now
assume 1 < i;then
1+1<=i by NAT_1:13;then
2+1<=i+1 by XREAL_1:6;
hence contradiction by A16,FINSEQ_1:45, L1;
end;then
A11: i = 1 by XXREAL_0:1,A17;
A15: 0 in {0} & 1 in {1} by TARSKI:def 1;
thus [fs.i, fs.(i+1)] in (the S-T_Arcs of N) &
[fs.(i+1),fs.(i+2)] in (the T-S_Arcs of N)
by A11, A12,ZFMISC_1:def 2, A15;
end;
fs.len fs = 0 by A12,FINSEQ_1:45, L1;
hence thesis by FINSEQ_1:45,L1,L3,L4,TARSKI:def 1;
end;
end;
registration
let PTN;
cluster directed_path_like -> non empty
for FinSequence of places_and_trans_of PTN;
coherence;
end;
:: With_directed_path Mode for place\transition Nets
definition
let IT be Petri_net;
attr IT is With_directed_path means :Def9:
ex fs being FinSequence of places_and_trans_of IT st
fs is directed_path_like;
end;
:: directed_circuit_like Attribute for FinSequence of
:: places_and_trans_of PetriNet
definition
let PTN;
attr PTN is With_directed_circuit means
:Def7:
ex fs st fs is directed_path_like circular almost-one-to-one;
end;
registration
cluster PetriNet -> decision_free_like With_directed_circuit Petri;
coherence
proof
set N = PetriNet;
now
let s be place of N;
thus ex t being transition of N st [t, s] in the T-S_Arcs of N
proof
reconsider t = 1 as transition of N by TARSKI:def 1;
take t;
thus thesis;
end;
thus for t1, t2 being transition of N st
[t1, s] in the T-S_Arcs of N &
[t2, s] in the T-S_Arcs of N holds t1 = t2
proof
let t1, t2 be transition of N;
assume [t1, s] in the T-S_Arcs of N &
[t2, s] in the T-S_Arcs of N;
t1 = 1 by TARSKI:def 1;
hence t1 = t2 by TARSKI:def 1;
end;
thus ex t being transition of N st [s, t] in the S-T_Arcs of N
proof
reconsider t = 1 as transition of N by TARSKI:def 1;
take t;
thus thesis;
end;
thus for t1, t2 being transition of N st
[s, t1] in the S-T_Arcs of N &
[s, t2] in the S-T_Arcs of N holds t1 = t2
proof
let t1, t2 be transition of N;
assume [s, t1] in the S-T_Arcs of N &
[s, t2] in the S-T_Arcs of N;
t1 = 1 by TARSKI:def 1;
hence t1 = t2 by TARSKI:def 1;
end;
end;
hence N is decision_free_like;
A5: 0 in the carrier of N by TARSKI:def 1;
1 in the carrier' of N by TARSKI:def 1;then
reconsider a0=0, a1=1 as Element of places_and_trans_of N
by A5,XBOOLE_0:def 3;
reconsider fs = <*a0,a1,a0*> as FinSequence of places_and_trans_of N;
fs is directed_path_like & fs is circular & fs is almost-one-to-one
by Th12,Th13;
hence N is With_directed_circuit;
Flow N c= [:the carrier of N, the carrier' of N:]
\/ [:the carrier' of N, the carrier of N:];
hence N is Petri by NET_1:def 2,ZFMISC_1:11;
end;
end;
registration
cluster With_directed_circuit Petri decision_free_like for Petri_net;
existence
proof
take PetriNet;
thus thesis;
end;
end;
registration
cluster With_directed_circuit -> With_directed_path for Petri_net;
coherence;
end;
registration
cluster With_directed_path for Petri_net;
existence
proof
take PetriNet;
thus thesis;
end;
end;
registration
let Dftn be With_directed_path Petri_net;
cluster directed_path_like for FinSequence of places_and_trans_of Dftn;
existence by Def9;
end;
reserve Dftn for With_directed_path Petri_net;
reserve dct for directed_path_like FinSequence of places_and_trans_of Dftn;
theorem Thd:
[dct.1, dct.2] in the S-T_Arcs of Dftn
proof
A3: 1 mod 2 = 1 by NAT_D:14;
len dct >= 3 by Def5;then
1 + 1 < len dct by XXREAL_0:2;
hence thesis by Def5, A3;
end;
theorem The:
[dct.(len dct -1), dct.(len dct)] in the T-S_Arcs of Dftn
proof
len dct >= 3 by Def5;then
reconsider ln2 = len dct - 2 as Element of NAT by NAT_1:21, XXREAL_0:2;
F8: 1 = (ln2 + 2) mod 2 by Def5
.= ((ln2 mod 2) + (2 mod 2)) mod 2 by NAT_D:66
.= ((ln2 mod 2) + 0) mod 2 by NAT_D:25
.= ln2 mod 2 by NAT_D:65;
len dct + (-1) < len dct by XREAL_1:30; then
[dct.(ln2 + 1), dct.(ln2 + 2)] in the T-S_Arcs of Dftn by Def5, F8;
hence thesis;
end;
reserve Dftn for With_directed_path Petri Petri_net,
dct for directed_path_like FinSequence of places_and_trans_of Dftn;
theorem Thc:
dct.i in places_of dct & i in dom dct implies i mod 2 = 1
proof
assume that
T2: dct.i in places_of dct and
T4: i in dom dct;
consider p be place of Dftn such that
T3: p = dct.i & p in rng dct by T2;
E1: 1 <= i & i <= len dct by T4,FINSEQ_3:25;
E41: i = len dct or i < len dct by XXREAL_0:1,E1;
i mod 2 = 1
proof
assume
E6: i mod 2 <> 1;
reconsider i1 = i - 1 as Element of NAT by NAT_1:21,T4, FINSEQ_3:25;
now
assume i1 mod 2 = 0;then
i1 + 1 mod 2 = 1 by NAT_D:16;
hence contradiction by E6;
end;then
i1 mod 2 = 1 by NAT_D:12;then
[dct.i1,dct.(i1+1)] in the S-T_Arcs of Dftn by E6,E41,Def5;then
dct.(i1+1) in the carrier' of Dftn by ZFMISC_1:87;
hence contradiction by XBOOLE_0:3,NET_1:def 2,T3;
end;
hence thesis;
end;
theorem Thcc:
dct.i in transitions_of dct & i in dom dct implies i mod 2 = 0
proof
assume that
T2: dct.i in transitions_of dct and
T4: i in dom dct;
L1: [dct.(len dct - 1),dct.len dct] in the T-S_Arcs of Dftn by The;
consider t be transition of Dftn such that
T3: t = dct.i & t in rng dct by T2;
T5: 1 <= i & i <= len dct by T4,FINSEQ_3:25;
i <> len dct
proof
assume i = len dct;then
dct.i in the carrier of Dftn by L1,ZFMISC_1:87;
hence contradiction by NET_1:def 2,XBOOLE_0:3,T3;
end;then
i < len dct by XXREAL_0:1,T5;then
H4: i+1 <= len dct by NAT_1:13;
assume i mod 2 <> 0;then
H1: i mod 2 = 2-1 by NAT_D:12;
i+1<>len dct
proof
assume
H6: i+1 = len dct;then
reconsider p = dct.(i+1) as place of Dftn by L1,ZFMISC_1:87;
1 <= 1+i by NAT_1:11;then
H5: i+1 in dom dct by FINSEQ_3:25,H6;then
p in rng dct by FUNCT_1:3;then
p in places_of dct;then
i+1 mod 2 = 1 by Thc,H5;
hence contradiction by NAT_D:69, H1;
end;then
i + 1 < len dct by XXREAL_0:1,H4;then
[dct.i,dct.(i+1)] in the S-T_Arcs of Dftn by Def5,H1;then
dct.i in the carrier of Dftn by ZFMISC_1:87;
hence contradiction by XBOOLE_0:3,T3,NET_1:def 2;
end;
theorem Thf:
dct.i in transitions_of dct & i in dom dct implies
[dct.(i-1),dct.i] in the S-T_Arcs of Dftn
& [dct.i,dct.(i+1)] in the T-S_Arcs of Dftn
proof
assume
H1: dct.i in transitions_of dct & i in dom dct;
L1: [dct.(len dct - 1),dct.len dct] in the T-S_Arcs of Dftn by The;
reconsider im1 = i - 1 as Element of NAT by NAT_1:21,FINSEQ_3:25,H1;
consider t be transition of Dftn such that
H6: t = dct.i & t in rng dct by H1;
H4: 1 <= i & i <= len dct by FINSEQ_3:25,H1;
now
assume im1 mod 2 = 0;then
im1 + 1 mod 2 = 1 by NAT_D:16;
hence contradiction by Thcc,H1;
end;then
H2: im1 mod 2 = 1 by NAT_D:12;
i <> len dct
proof
assume i = len dct;then
dct.i in the carrier of Dftn by L1,ZFMISC_1:87;
hence contradiction by H6,NET_1:def 2 ,XBOOLE_0:3;
end;then
H3: im1 + 1 < len dct by XXREAL_0:1,H4;
hence [dct.(i-1),dct.i] in the S-T_Arcs of Dftn by Def5,H2;
[dct.(im1+1),dct.(im1+2)] in the T-S_Arcs of Dftn by Def5,H2,H3;
hence thesis;
end;
theorem Thg:
dct.i in places_of dct & 1 < i & i < len dct implies
[dct.(i-2),dct.(i-1)] in the S-T_Arcs of Dftn
& [dct.(i-1),dct.i] in the T-S_Arcs of Dftn
& [dct.i,dct.(i+1)] in the S-T_Arcs of Dftn
& [dct.(i+1),dct.(i+2)] in the T-S_Arcs of Dftn & 3 <= i
proof
assume
H1: dct.i in places_of dct & 1 < i & i < len dct; then
P1: i in dom dct by FINSEQ_3:25;then
H4: i mod 2 = 1 by Thc,H1;
L1: [dct.(len dct - 1),dct.len dct] in the T-S_Arcs of Dftn by The;
L2: [dct.1,dct.2] in the S-T_Arcs of Dftn by Thd;
consider p be place of Dftn such that
H6: p = dct.i & p in rng dct by H1;
H8: 1+1 <= i by H1,NAT_1:13;then
reconsider im2 = i - 2 as Element of NAT by NAT_1:21;
now
assume im2 mod 2 = 0;then
im2 + 1 mod 2 = 1 mod 2 by NAT_D:17 .= 2 - 1 by NAT_D:14;then
im2 + 1 + 1 mod 2 = 0 by NAT_D:69;
hence contradiction by Thc,H1, P1;
end;then
H2: im2 mod 2 = 1 by NAT_D:12;
P2: i - 1 < len dct by H1,XREAL_1:147;then
[dct.im2,dct.(im2+1)] in the S-T_Arcs of Dftn by Def5,H2;
hence [dct.(i-2),dct.(i-1)] in the S-T_Arcs of Dftn;
[dct.(im2+1),dct.(im2+2)] in the T-S_Arcs of Dftn by Def5,H2,P2;
hence [dct.(i-1),dct.i] in the T-S_Arcs of Dftn;
H9: i+1<= len dct by NAT_1:13,H1;
i + 1 <> len dct
proof
assume i + 1 = len dct;then
dct.(i+1-1) in the carrier' of Dftn by L1,ZFMISC_1:87;
hence contradiction by NET_1:def 2,XBOOLE_0:3,H6;
end;then
H5: i+1 i
proof
assume i = 2;then
dct.i in the carrier' of Dftn by L2,ZFMISC_1:87;
hence contradiction by NET_1:def 2,H6,XBOOLE_0:3;
end;then
2 < i by XXREAL_0:1,H8;then
2+1<=i by NAT_1:13;
hence 3 <= i;
end;
begin :: Firable and Firing Conditions for Transitions with natural marking
reserve M0 for marking of PTN,
t for transition of PTN,
Q,Q1 for FinSequence of the carrier' of PTN;
definition
let PTN,M0,t;
pred t is_firable_at M0 means
for m being Nat holds m in M0.:*'{t} implies m > 0;
end;
notation
let PTN,M0,t;
antonym t is_not_firable_at M0 for t is_firable_at M0;
end;
definition
let PTN,M0,t;
func Firing(t, M0) -> marking of PTN means
:Def11:
for s being place of PTN holds
(s in *'{t} & not s in {t}*' implies it.s = M0.s -1) &
(s in {t}*' & not s in *'{t} implies it.s = M0.s + 1) &
((s in *'{t} & s in {t}*') or (not s in *'{t} & not s in {t}*')
implies it.s = M0.s) if t is_firable_at M0
otherwise it = M0;
existence
proof
defpred P[place of PTN, set] means
( $1 in *'{t} & not $1 in {t}*' implies $2 = M0.$1 -1) &
( $1 in {t}*' & not $1 in *'{t} implies $2 = M0.$1 + 1) &
(($1 in *'{t} & $1 in {t}*') or (not $1 in *'{t} & not $1 in {t}*')
implies $2 = M0.$1);
thus t is_firable_at M0 implies ex M be marking of PTN st
for s being place of PTN holds P[s, M.s]
proof
assume
A1: t is_firable_at M0;
A2: now
let x be Element of PTN;
per cases;
suppose
S1: x in *'{t} & not x in {t}*';
dom M0 = the carrier of PTN by FUNCT_2:def 1;then
[x, M0.x] in M0 by FUNCT_1:def 2;then
M0.x in M0.:*'{t} by RELAT_1:def 13, S1; then
reconsider M0x = M0.x - 1 as Element of NAT by NAT_1:20, A1;
P[x, M0x] by S1;
hence ex y being Element of NAT st P[x, y];
end;
suppose x in {t}*' & not x in *'{t};
hence ex y being Element of NAT st P[x, y];
end;
suppose
(x in *'{t} & x in {t}*') or (not x in *'{t} & not x in {t}*');
hence ex y being Element of NAT st P[x, y];
end;
end;
consider M being Function of the carrier of PTN, NAT such that
A3: for x being Element of the carrier of PTN holds P[x, M.x]
from FUNCT_2:sch 3(A2);
reconsider M as marking of PTN by FUNCT_2:8;
take M;
thus thesis by A3;
end;
thus not t is_firable_at M0 implies ex M be marking of PTN st M = M0;
end;
uniqueness
proof
let M1, M2 be marking of PTN;
defpred P[marking of PTN] means
for s being place of PTN holds
( s in *'{t} & not s in {t}*' implies $1.s = M0.s -1) &
( s in {t}*' & not s in *'{t} implies $1.s = M0.s + 1) &
((s in *'{t} & s in {t}*') or (not s in *'{t} & not s in {t}*') implies
$1.s = M0.s);
thus t is_firable_at M0 & P[M1] & P[M2] implies M1 = M2
proof
assume
A4: t is_firable_at M0 & P[M1] & P[M2];
for x being object st x in the carrier of PTN holds M1.x = M2.x
proof
let x be object;
assume x in the carrier of PTN;
then reconsider x1 = x as place of PTN;
per cases;
suppose
S1: x in *'{t} & not x in {t}*';
hence M1.x = M0.x -1 by A4
.= M2.x by S1, A4;
end;
suppose
S2: x in {t}*' & not x in *'{t};
hence M1.x = M0.x + 1 by A4
.= M2.x by S2, A4;
end;
suppose
S3: (x in *'{t} & x in {t}*') or (not x in *'{t} & not x in {t}*');
thus M1.x = M1.x1
.= M0.x by S3, A4
.= M2.x1 by S3, A4
.= M2.x;
end;
end;
hence M1 = M2 by FUNCT_2:12;
end;
thus not t is_firable_at M0 & M0 = M1 & M0 = M2 implies M1 = M2;
end;
correctness;
end;
definition
let PTN,M0,Q;
pred Q is_firable_at M0 means
Q = {} or
ex M being FinSequence of nat_marks_of PTN st len Q = len M &
Q/.1 is_firable_at M0 & M/.1 = Firing(Q/.1, M0) &
for i st i < len Q & i > 0 holds
Q/.(i+1) is_firable_at M/.i & M/.(i+1) = Firing(Q/.(i+1), M/.i);
end;
notation
let PTN,M0,Q;
antonym Q is_not_firable_at M0 for Q is_firable_at M0;
end;
definition
let PTN,M0,Q;
func Firing(Q, M0) -> marking of PTN means
:Defb:
it = M0 if Q = {}
otherwise
ex M being FinSequence of nat_marks_of PTN st len Q = len M & it = M/.len M
& M/.1 = Firing(Q/.1, M0)
& for i st i < len Q & i > 0 holds M/.(i+1) = Firing(Q/.(i+1),M/.i);
existence
proof
defpred P2[Nat] means for Q being FinSequence of the
carrier' of PTN st $1 = len Q holds (Q = {} implies ex M1 being
marking of PTN st M1 = M0) & (Q <> {} implies ex M2 being
marking of PTN st ex M being FinSequence of nat_marks_of PTN st len Q
= len M & M2 = M/.len M & M/.1 = Firing(Q/.1, M0)
& for i st i < len Q & i > 0 holds M/.(i+1) = Firing(Q/.(i+1), M/.i));
A1: now
let n be Nat;
assume
A2: P2[n];
thus P2[n+1]
proof
let Q be FinSequence of the carrier' of PTN such that
A3: n+1 = len Q;
thus Q = {} implies ex M1 being marking of PTN st M1 = M0;
thus Q <> {} implies ex M2 being marking of PTN, M being
FinSequence of nat_marks_of PTN st len Q = len M & M2 = M/.len M & M/.1 =
Firing(Q/.1, M0) & for i st i < len Q & i > 0
holds M/.(i+1) = Firing(Q/.(i+1), M/.i)
proof
assume Q <> {};
then len Q <> 0;
then consider Q1 being FinSequence of the carrier' of PTN,
t being transition of PTN such that
A4: Q = Q1 ^ <*t*> by FINSEQ_2:19;
A5: n + 1 = len Q1 + 1 by A3,A4,FINSEQ_2:16;
per cases;
suppose
A6: Q1 = {};
take M2 = Firing(t, M0);
take M = <*M2*>;
A7: len Q = len Q1 + len <*t*> by A4,FINSEQ_1:22
.= 0 + 1 by FINSEQ_1:39,A6;
hence len Q = len M by FINSEQ_1:39;
hence M2 = M/.len M by A7,FINSEQ_4:16;
Q = <*t*> by A4,A6,FINSEQ_1:34;
then Q/.1 = t by FINSEQ_4:16;
hence M/.1 = Firing(Q/.1, M0) by FINSEQ_4:16;
let i;
assume i < len Q & i > 0;
hence thesis by A7,NAT_1:13;
end;
suppose
A8: Q1 <> {}; then
0 + 1 < len Q1 + 1 by XREAL_1:6;
then 1 <= len Q1 by NAT_1:13; then
A10: 1 in dom Q1 by FINSEQ_3:25;
A11: len Q = len Q1 + len<*t*> by A4,FINSEQ_1:22
.= len Q1 + 1 by FINSEQ_1:40;
consider B2 being marking of PTN, B being FinSequence of
nat_marks_of PTN such that
A12: len Q1 = len B and
A13: B2 = B/.len B and
A14: B/.1 = Firing(Q1/.1,M0) and
A15: for i st i < len Q1 & i > 0 holds B
/.(i+1) = Firing(Q1/.(i+1),B/.i) by A2,A5,A8;
take M2 = Firing(t,B2);
take M = B ^ <*M2*>;
A16: len M = len B + len<*M2*> by FINSEQ_1:22
.=len B + 1 by FINSEQ_1:40;
hence len Q = len M by A12,A11;
thus M2 = M/.len M by A16,FINSEQ_4:67;
0 + 1 < len B + 1 by A12,A8,XREAL_1:6;then
A17: 1 <= len B by NAT_1:13;
then 1 in dom B by FINSEQ_3:25;
hence M/.1 = B/.1 by FINSEQ_4:68
.= Firing(Q/.1, M0) by A4,A14,A10,FINSEQ_4:68;
let i such that
A18: i < len Q and
A19: i > 0;
thus M/.(i+1) = Firing(Q/.(i+1), M/.i)
proof
1 <= i + 1 & i + 1 <= len Q1 + 1 by A11,A18,NAT_1:12,13; then
A20: Seg (len Q1 + 1) = Seg (len Q1) \/ {len Q1 + 1} &
i + 1 in Seg (len Q1 + 1) by FINSEQ_1:9,FINSEQ_1:1;
per cases by A20,XBOOLE_0:def 3;
suppose
A21: i + 1 in Seg len Q1;
then i + 1 <= len B by A12,FINSEQ_1:1;
then i + 1 <= len B + 1 by NAT_1:12; then
A22: i <= len B by XREAL_1:6;
0 + 1 < i + 1 by A19,XREAL_1:6;
then 1 <= i by NAT_1:13; then
A23: i in dom B by A22,FINSEQ_3:25;
i + 1 <= len Q1 by A21,FINSEQ_1:1;
then i < len Q1 by NAT_1:13; then
A24: B/.(i+1) = Firing(Q1/.(i+1), B/.i) by A15,A19;
i+1 in dom Q1 by A21,FINSEQ_1:def 3; then
A25: Q1/.(i+1) = Q/.(i+1) by A4,FINSEQ_4:68;
i+1 in dom B by A12,A21,FINSEQ_1:def 3;
then B/.(i+1) = M/.(i+1) by FINSEQ_4:68;
hence thesis by A24,A25,A23,FINSEQ_4:68;
end;
suppose
A26: i + 1 in {len Q1 + 1};
A27: len B in dom B by A17,FINSEQ_3:25;
A28: i + 1 = len Q1 + 1 by A26,TARSKI:def 1;
then M/.(i+1) = M2 & Q/.(i+1) = t by A4,A12,FINSEQ_4:67;
hence thesis by A12,A13,A28,A27,FINSEQ_4:68;
end;
end;
end;
end;
end;
end;
A29: P2[0];
for n being Nat holds P2[n] from NAT_1:sch 2(A29,A1);
hence thesis;
end;
uniqueness
proof
let B1,B2 be marking of PTN;
thus Q = {} & B1 = M0 & B2 = M0 implies B1 = B2;
assume Q <> {};
given M1 being FinSequence of nat_marks_of PTN such that
A30: len Q = len M1 and
A31: B1 = M1/.len M1 and
A32: M1/.1 = Firing(Q/.1, M0) and
A33: for i st i < len Q & i > 0 holds M1/.(i+1) = Firing(Q/.(i+1), M1/.i);
A34: dom M1 = Seg len Q by A30,FINSEQ_1:def 3;
given M2 being FinSequence of nat_marks_of PTN such that
A35: len Q = len M2 and
A36: B2 = M2/.len M2 and
A37: M2/.1 = Firing(Q/.1, M0) and
A38: for i st i < len Q & i > 0 holds M2/.(i + 1) =
Firing(Q/.(i + 1), M2/.i);
defpred P2[Nat] means $1 in Seg len Q implies M1/.$1 = M2/.$1;
A39: now
let j be Nat;
assume
A40: P2[j];
now
assume
A41: j + 1 in Seg len Q;
per cases;
suppose
j = 0;
hence M1/.(j + 1) = M2/.(j + 1) by A32,A37;
end;
suppose
A42: j <> 0;
j + 1 <= len Q & j < j + 1 by A41,FINSEQ_1:1,XREAL_1:29; then
A44: j < len Q by XXREAL_0:2;
1 <= j by A42,NAT_1:14;then
B2: j in dom Q by A44,FINSEQ_3:25;
thus M1/.(j + 1) = Firing(Q/.(j+1), M1/.j) by A33,A44,A42
.= M2/.(j + 1) by A38,A44,A42,A40,FINSEQ_1:def 3,B2;
end;
end;
hence P2[j + 1];
end;
A45: P2[0] by FINSEQ_1:1;
A46: for j being Nat holds P2[j] from NAT_1:sch 2(A45,A39);
now
let j be Nat;
assume
A47: j in dom M1; then
A48: j in dom M2 by A35,A34,FINSEQ_1:def 3;
thus M1.j = M1/.j by A47,PARTFUN1:def 6
.= M2/.j by A46,A34,A47
.= M2.j by A48,PARTFUN1:def 6;
end;
hence B1 = B2 by A30,A31,A35,A36,FINSEQ_2:9;
end;
correctness;
end;
theorem
Firing(t, M0) = Firing(<*t*>, M0)
proof
set Q = <*t*>;
consider M be FinSequence of nat_marks_of PTN such that
A1: len Q = len M & Firing(Q, M0) = M/.len M & M/.1 = Firing(Q/.1, M0) &
for i st i < len Q & i > 0 holds M/.(i+1) = Firing(Q/.(i+1),M/.i) by Defb;
thus Firing(<*t*>, M0) = Firing(<*t*>/.1, M0) by A1,FINSEQ_1:39
.= Firing(t, M0) by FINSEQ_4:16;
end;
theorem
t is_firable_at M0 iff <*t*> is_firable_at M0
proof
hereby
set M = <*Firing(<*t*>/.1, M0)*>;
A1: M/.1 = Firing(<*t*>/.1, M0) by FINSEQ_4:16;
A2: now
A3: len <*t*> = 0 + 1 by FINSEQ_1:39;
let i;
assume i < len <*t*> & i > 0;
hence <*t*>/.(i+1) is_firable_at M/.i &
M/.(i+1) = Firing(<*t*>/.(i+1), M/.i) by A3,NAT_1:13;
end;
assume t is_firable_at M0; then
A4: <*t*>/.1 is_firable_at M0 by FINSEQ_4:16;
len <*t*> = 1 by FINSEQ_1:39
.= len M by FINSEQ_1:39;
hence <*t*> is_firable_at M0 by A4,A1,A2;
end;
assume <*t*> is_firable_at M0;
hence t is_firable_at M0 by FINSEQ_4:16;
end;
theorem
Firing(Q^Q1, M0) = Firing(Q1, Firing(Q,M0))
proof
now
per cases;
case
A1: Q = {} & Q1 = {};then
A2: Q^Q1 = {} by FINSEQ_1:34;
Firing(Q1,Firing(Q,M0)) = Firing(Q1,M0) by A1,Defb .= M0 by A1,Defb;
hence thesis by A2,Defb;
end;
case
A3: Q = {} & Q1 <> {};
then Firing(Q^Q1,M0) = Firing(Q1,M0) by FINSEQ_1:34;
hence thesis by A3,Defb;
end;
case
A4: Q <> {} & Q1 = {};
then Firing(Q^Q1,M0) = Firing(Q,M0) by FINSEQ_1:34;
hence thesis by A4,Defb;
end;
case
A5: Q <> {} & Q1 <> {};
then consider M3 being FinSequence of nat_marks_of PTN such that
A6: len Q = len M3 & Firing(Q,M0) = M3/.len M3 and
A7: M3/.1 = Firing(Q/.1,M0) and
A8: for i st i < len Q & i > 0
holds M3/.(i+1) = Firing(Q/.(i+1),M3/.i) by Defb;
consider M being FinSequence of nat_marks_of PTN such that
A9: len (Q^Q1) = len M and
A10: Firing(Q^Q1,M0) = M/.len M and
A11: M/.1 = Firing((Q^Q1)/.1,M0) and
A12: for i st i < len (Q^Q1) & i > 0 holds M/.
(i+1) = Firing((Q^Q1)/.(i+1),M/.i) by A5,Defb;
defpred P2[Nat] means 1+$1<=len Q
implies M/.(1+$1)=M3/.(1+$1);
0+len Q 0
holds M4/.(i+1) = Firing(Q1/.(i+1),M4/.i) by A5,Defb;
consider k being Nat such that
A25: len M4 = k + 1 by A5,A21,NAT_1:6;
A26: P2[0] by A11,A7,BOOLMARK:7;
A27: for k being Nat holds P2[k] from NAT_1:sch 2(A26,A14);
defpred P2[Nat] means 1+$1<=len Q1
implies M/.(len Q+1+$1)= M4/.(1+$1);
A28: now
let k be Nat;
assume
A29: P2[k];
A30: len Q + 1+k+1 = len Q + 1 + (k+1) & 0 {};
hence Q is_firable_at M0;
Q^Q1 = Q1 by A2,FINSEQ_1:34;
hence Q1 is_firable_at Firing(Q, M0) by A1, A2, Defb;
end;
case
A3: Q <> {} & Q1 = {};
hence Q1 is_firable_at Firing(Q, M0);
thus Q is_firable_at M0 by A1, A3, FINSEQ_1:34;
end;
case
A4: Q <> {} & Q1 <> {};
let i;
A5: 0+1<=len Q1 by NAT_1:13, A4;then
A6: Q1/.1 = (Q^Q1)/.(len Q + 1) by SEQ_4:136;
reconsider m = len Q - 1 as Element of NAT by A4,NAT_1:20;
consider M4 being FinSequence of nat_marks_of PTN such that
A7: len Q1 = len M4 and
Firing(Q1, Firing(Q,M0)) = M4/.len M4 and
A8: M4/.1 = Firing(Q1/.1, Firing(Q,M0)) and
A9: for i st i < len Q1 & i > 0
holds M4/.(i+1) = Firing(Q1/.(i+1),M4/.i) by A4,Defb;
consider M3 being FinSequence of nat_marks_of PTN such that
A10: len Q = len M3 and
A11: Firing(Q,M0) = M3/.len M3 and
A12: M3/.1 = Firing(Q/.1,M0) and
A13: for i st i < len Q & i > 0 holds M3/.(i+1) = Firing(Q/.(i+1),M3/.i)
by A4,Defb;
consider j being Nat such that
A14: len M3 = j + 1 by A4,A10,NAT_1:6;
consider M being FinSequence of nat_marks_of PTN such that
len (Q^Q1) = len M and
A15: (Q^Q1)/.1 is_firable_at M0 and
A16: M/.1 = Firing((Q^Q1)/.1,M0) and
A17: for i st i < len (Q^Q1) & i > 0 holds (Q^Q1)/.(i+1) is_firable_at M/.i
& M/.(i+1) = Firing((Q^Q1)/.(i+1),M/.i) by A1,A4;
defpred P2[Nat] means
1 + $1 <= len Q implies M/.(1 + $1)=M3/.(1 + $1);
0 + len Q < len Q + len Q1 by XREAL_1:6,A4;then
A18: len Q < len (Q^Q1) by FINSEQ_1:22;
A19: now
let k be Nat;
assume
A21: P2[k];
now
assume
A22: 1 + (k+1)<= len Q; then
A23: (Q^Q1)/.(1+(k+1)) = Q/.(1+(k+1)) by BOOLMARK:7,NAT_1:11;
A24: 1 + k < len Q by A22,NAT_1:13;
then 1 + k < len (Q^Q1) by A18,XXREAL_0:2;
then M/.(1 + (k+1)) = Firing(Q/.(1+(k+1)),M3/.(1+k))
by A17,A21,A22,A23,NAT_1:13;
hence M/.(1+(k+1)) = M3/.(1+(k+1)) by A13, A24;
end;
hence P2[k+1];
end;
A25: P2[0] by A16,A12,BOOLMARK:7;
A26: for k being Nat holds P2[k] from NAT_1:sch 2(A25,A19);
A27: now
let i;
assume that
A28: i < len Q and
A29: i > 0;
consider j being Nat such that
A30: i = j + 1 by A29,NAT_1:6;
A33: i + 1 >= 1 & i + 1 <= len Q by A28,NAT_1:11,13;then
i + 1 in dom Q by FINSEQ_3:25;then
A31: (Q^Q1)/.(i+1) = Q/.(i+1) by FINSEQ_4:68;
A32: M/.i = M3/.i by A26,A28,A30;
A34: i < len (Q^Q1) by A18,A28,XXREAL_0:2;
then M/.(i+1) = Firing((Q^Q1)/.(i+1),M/.i) by A17,A29;
hence Q/.(i+1) is_firable_at M3/.i & M3/.(i+1) = Firing(Q/.(i+1),M3/.i)
by A17,A26,A29,A34,A31,A32,A33;
end;
defpred P2[Nat] means 1+$1<=len Q1 implies M/.(len Q+1+$1)= M4/.(1+$1);
A35: now
let k be Nat;
assume
A36: P2[k];
A37: len Q + 1 + k+1 = len Q + 1 + (k+1) & 0 0;
consider j being Nat such that
A48: i = j + 1 by A47,NAT_1:6;
len Q + 1 + j = len Q + (j + 1);then
A49: M/.(len Q + i) = M4/.i by A44,A46,A48;
a52: i + 1 >= 1 & i + 1 <= len Q1 by A46,NAT_1:11,13;then
A50: i + 1 in dom Q1 by FINSEQ_3:25;
A51: (Q^Q1)/.(len Q+i+1) = (Q^Q1)/.(len Q+(i+1))
.= Q1/.(i+1) by A50,FINSEQ_4:69;
A52: len Q + 1 + i = len Q + i + 1;
len (Q^Q1) = len Q + len Q1 by FINSEQ_1:22;then
A53: len Q + i < len (Q^Q1) by A46,XREAL_1:6;
M/.(len Q+i+1) = Firing((Q^Q1)/.(len Q+i+1),M/.(len Q+i))
by A17,A53,A4;
hence Q1/.(i+1) is_firable_at M4/.i &
M4/.(i+1) = Firing(Q1/.(i+1),M4/.i)
by A17,A44,A53,A51,A49,A52,A47,a52;
end;
M/.len M3 = M3/.len M3 by A10,A26,A14;
hence Q1 is_firable_at Firing(Q,M0) by A11,A7,A8,A45,A17,A10,A4,A18,A6;
0+1<=len Q by A4,NAT_1:13;
then Q/.1 is_firable_at M0 by A15,BOOLMARK:7;
hence Q is_firable_at M0 by A10,A12,A27;
end;
end;
hence thesis;
end;
begin
:: The theorem stating that the number of tokens in a circuit
:: remains the same after any firing sequence
theorem Thb:
for Dftn being With_directed_path Petri decision_free_like Petri_net,
dct being directed_path_like FinSequence of places_and_trans_of Dftn,
t being transition of Dftn st dct is circular
& ex p1 being place of Dftn st p1 in places_of dct &
([p1, t] in the S-T_Arcs of Dftn or [t, p1] in the T-S_Arcs of Dftn)
holds t in transitions_of dct
proof
let Dftn be With_directed_path Petri decision_free_like Petri_net,
dct be directed_path_like FinSequence of places_and_trans_of Dftn,
t be transition of Dftn;
set P = places_of dct;
assume that
L1: dct is circular and
L2: ex p1 being place of Dftn st p1 in P
& ([p1, t] in the S-T_Arcs of Dftn or [t, p1] in the T-S_Arcs of Dftn);
consider p1 being place of Dftn such that
A5: p1 in P and
A6: [p1, t] in the S-T_Arcs of Dftn or [t, p1] in the T-S_Arcs of Dftn by L2;
consider p1n be place of Dftn such that
A9: p1n = p1 & p1n in rng dct by A5;
consider i be object such that
A11: i in dom dct and
A12: dct.i = p1 by FUNCT_1:def 3, A9;
reconsider i as Element of NAT by A11;
E1: 1 <= i & i <= len dct by A11, FINSEQ_3:25;
E10: i mod 2 = 1 by Thc, A5, A11, A12;
F3: [dct.1, dct.2] in the S-T_Arcs of Dftn by Thd;
H1: 3 <= len dct by Def5;then
G4: 2 <= len dct by XXREAL_0:2;then
F2: 2 in dom dct by FINSEQ_3:25;
F3a: [dct.(len dct -1), dct.(len dct)] in the T-S_Arcs of Dftn by The;
reconsider ln1 = len dct - 1 as Element of NAT
by NAT_1:21,XXREAL_0:2,H1;
P2: 2 + -1 <= len dct + -1 by XREAL_1:6,G4;
len dct + -1 < len dct by XREAL_1:30;then
F2a: ln1 in dom dct by FINSEQ_3:25,P2;
per cases by XXREAL_0:1, E1;
suppose
F4: 1 = i or i = len dct;
per cases by A6;
suppose
F10: [p1, t] in the S-T_Arcs of Dftn;
reconsider t1 = dct.2 as transition of Dftn by ZFMISC_1:87, F3;
[p1, t1] in the S-T_Arcs of Dftn by F3,Lm1,L1,A12, F4;then
t= t1 by Def1, F10; then
t in rng dct by FUNCT_1:3, F2;
hence thesis;
end;
suppose
F10a: [t,p1] in the T-S_Arcs of Dftn;
reconsider tn1 = dct.(len dct - 1)
as transition of Dftn by ZFMISC_1:87,F3a;
[tn1, p1] in the T-S_Arcs of Dftn by F3a, Lm1,L1,A12, F4;then
tn1 = t by Def1, F10a;then
t in rng dct by FUNCT_1:3, F2a;
hence thesis;
end;
end;
suppose
F41: 1 < i & i < len dct;
per cases by A6;
suppose
B8: [p1, t] in the S-T_Arcs of Dftn;
F40: i + 1 <= len dct by NAT_1:13, F41;
now
assume
E24: i + 1 = len dct;
i mod 2 = 2 - 1 by Thc, A5, A11, A12;then
i + 1 mod 2 = 0 by NAT_D:69;
hence contradiction by Def5, E24;
end;then
E12: i + 1 < len dct by XXREAL_0:1,F40;
[p1, dct.(i+1)] in the S-T_Arcs of Dftn by A12,Def5,E10,E12;then
reconsider t1 = dct.(i+1) as transition of Dftn by ZFMISC_1:87;
A20: i+1 in dom dct by FINSEQ_3:25,NAT_1:11,F40;
[p1, t1] in the S-T_Arcs of Dftn by A12,Def5,E10,E12;then
t = t1 by Def1,B8;
then t in rng dct by FUNCT_1:3,A20;
hence thesis;
end;
suppose
B8a: [t, p1] in the T-S_Arcs of Dftn;
F46: 1 + 1 <= i by F41, NAT_1:13;
reconsider i1 = i - 2 as Element of NAT by NAT_1:21,F46;
P5: i + (-1) < len dct by F41,XREAL_1:36;
1 = i1 + 2 mod 2 by Thc,A5,A11,A12
.= ((i1 mod 2) + (2 mod 2)) mod 2 by NAT_D:66
.= ((i1 mod 2) + 0) mod 2 by NAT_D:25
.= i1 mod 2 by NAT_D:65;then
P8: [dct.(i1 + 1), dct.(i1 + 2)] in the T-S_Arcs of Dftn by Def5,P5;
then
reconsider t0 = dct.(i1 + 1) as transition of Dftn by ZFMISC_1:87;
2 + (-1) <= i + (-1) by XREAL_1:6,F46;then
P6: i1 + 1 in dom dct by FINSEQ_3:25,P5;
t0 = t by Def1,B8a, A12,P8;then
t in rng dct by FUNCT_1:3,P6;
hence thesis;
end;
end;
end;
definition
mode Decision_free_PT is
With_directed_circuit Petri decision_free_like Petri_net;
end;
registration
let Dftn be With_directed_circuit Petri_net;
cluster directed_path_like circular almost-one-to-one
for FinSequence of places_and_trans_of Dftn;
existence by Def7;
end;
definition
let Dftn be With_directed_circuit Petri_net;
mode Circuit_of_places_and_trans of Dftn is
directed_path_like circular almost-one-to-one
FinSequence of places_and_trans_of Dftn;
end;
theorem Th7:
for Dftn being Decision_free_PT,
dct being Circuit_of_places_and_trans of Dftn,
M0 being marking of Dftn, t being transition of Dftn
holds num_marks(places_of dct, M0) = num_marks(places_of dct, Firing(t, M0))
proof
let Dftn be With_directed_circuit Petri Decision_free_PT,
dct be Circuit_of_places_and_trans of Dftn,
M0 be marking of Dftn, t be transition of Dftn;
A65a: dct/^1 is one-to-one by JORDAN23:14;
set P = places_of dct;
A21: len dct >= 3 by Def5;then
1 <= len dct by XXREAL_0:2; then
X1: 1 in dom dct by FINSEQ_3:25;
L2: [dct.(len dct - 1),dct.len dct] in the T-S_Arcs of Dftn by The;
L1: [dct.1,dct.2] in the S-T_Arcs of Dftn by Thd;then
reconsider dct1 = dct.1 as place of Dftn by ZFMISC_1:87;
dct1 in rng dct by FUNCT_1:3,X1;then
K23: dct.1 in P;
set pl = the Enumeration of P;
set FM0 = Firing(t, M0),
mM0 = the Enumeration of M0,P,
mFM0 = the Enumeration of FM0,P;
per cases;
suppose
A10: t is_firable_at M0;
per cases;
suppose
t in transitions_of dct;then
consider t1 be transition of Dftn such that
A46: t1 = t & t1 in rng dct;
consider n be object such that
A47: n in dom dct & dct.n = t by FUNCT_1:def 3,A46;
G2: dct.n in transitions_of dct by A46,A47;
reconsider n as Element of NAT by A47;
K12: 1 <= n & n <= len dct by A47,FINSEQ_3:25;
K8: t in {t} by TARSKI:def 1;
per cases by A21,XXREAL_0:1;
suppose
K10: len dct = 3;
K13: 1 mod 2 = 1 by NAT_D:14;
(2*1) mod 2 = 0 by NAT_D:13;then
K14: (2+1) mod 2 = 1 by K13,NAT_D:17;
X4: n mod 2 = 0 by Thcc,G2,A47;then
n <> 1 & n <> 3 by NAT_D:14,K14;then
1 < n & n < 3 by K12,K10,XXREAL_0:1;then
X5: 1+1 <= n by NAT_1:13;
n < 2 + 1 by K12,K10,XXREAL_0:1,K14,X4;then
n <= 2 by NAT_1:13;then
K7: t = dct.2 by A47,XXREAL_0:1,X5;
K21: rng pl = {dct.1}
proof
thus rng pl c= {dct.1}
proof
let x be object;
assume x in rng pl;then
x in P by RLAFFIN3:def 1;then
consider p be place of Dftn such that
K24: p = x & p in rng dct;
consider y be object such that
K25: y in dom dct & dct.y = p by FUNCT_1:def 3,K24;
reconsider y as Element of NAT by K25;
K26: 1 <= y & y <= 3 by FINSEQ_3:25,K25,K10;then
1 = y or 1 < y by XXREAL_0:1;then
X7: 1 = y or 1+1 <= y by NAT_1:13;
X6: 3 = y or y < 2+1 by K26,XXREAL_0:1;
K34: y <> 2 by XBOOLE_0:3,NET_1:def 2,K25,K7;
x = dct.1 by K24,K25,NAT_1:22,X6,X7,K34, Lm1,K10;
hence x in {dct.1} by TARSKI:def 1;
end;
let x be object;
assume x in {dct.1};then
x = dct.1 by TARSKI:def 1;
hence x in rng pl by RLAFFIN3:def 1,K23;
end;
pl <> {} by K21;then
X7: len pl >= 0+1 by NAT_1:13;
A24: len pl = 1
proof
assume len pl <> 1;then
len pl > 1 by XXREAL_0:1,X7;then
len pl >= 1+1 by NAT_1:13;then
K47: 2 in dom pl by FINSEQ_3:25;then
K45: pl.2 in rng pl by FUNCT_1:def 3;
K46: 1 in dom pl by X7,FINSEQ_3:25;then
K49: pl.1 in rng pl by FUNCT_1:def 3;
pl.2 = dct.1 by TARSKI:def 1,K21,K45
.= pl.1 by K21,K49,TARSKI:def 1;
hence contradiction by FUNCT_1:def 4,K46,K47;
end;then
A25: len mFM0 = 1 by Def12,K23;
A26: len mM0 = 1 by Def12,A24,K23;
pl = <*dct.1*> by FINSEQ_1:39,A24,K21;then
K9: pl.1 = dct.1 by FINSEQ_1:40;
reconsider pl1 = pl.1 as place of Dftn by L1,ZFMISC_1:87,K9;
K11: pl.1 = dct.3 by K10,K9,Lm1;
consider f be S-T_arc of Dftn such that
K5: f = [pl1,t] by K7,K9,L1;
K4: pl1 in *'{t} by K5,K8;
consider g be T-S_arc of Dftn such that
K5a: g = [t,pl1] by K10,K7,K11,L2;
K4a: pl1 in {t}*' by K8,K5a;
K2: dom mM0 = dom mFM0 by FINSEQ_3:29,A25,A26;
now
let x be Element of NAT;
assume
C13b: x in dom mM0;then
1 <= x & x <= len mM0 by FINSEQ_3:25;then
K3: x = 1 by NAT_1:25,A26;
hence mM0.x = M0.pl1 by Def12,C13b,K23
.= FM0.pl1 by Def11,K4,A10,K4a
.= mFM0.x by K2,C13b,Def12,K23,K3;
end;
hence num_marks(P, Firing(t, M0)) = num_marks(P, M0)
by PARTFUN1:5,K2;
end;
suppose
A74: len dct > 3;
A81: 1 < len dct by A74,XXREAL_0:2;
A53a: 1 <= n by FINSEQ_3:25,A47;
A53b: 2 < len dct by XXREAL_0:2,A74;
now
assume 1 = n;then
dct.n in the carrier of Dftn by L1,ZFMISC_1:87;
hence contradiction by XBOOLE_0:3,NET_1:def 2,A47;
end;then
A62: 1 < n by A53a,XXREAL_0:1;then
A48: 1+1 <= n by NAT_1:13;
A80: 1 < n + 1 by A53a,NAT_1:16;
A53: n <= len dct by A47,FINSEQ_3:25;
now
assume n = len dct;then
dct.n in the carrier of Dftn by L2,ZFMISC_1:87;
hence contradiction by XBOOLE_0:3,NET_1:def 2,A47;
end;then
n < len dct by A53,XXREAL_0:1;then
A82: n+1 <= len dct by NAT_1:13;
reconsider nm1 = n - 1 as Element of NAT by FINSEQ_3:26,A47;
A78: 2 + (-1) <= n + (-1) by A48,XREAL_1:6;
A87: nm1 < len dct by XXREAL_0:2, A53,XREAL_1:146;then
G3: nm1 in dom dct by FINSEQ_3:25,A78;
A56: [dct.nm1,dct.n] in the S-T_Arcs of Dftn by Thf,G2,A47;
[dct.n,dct.(n+1)] in the T-S_Arcs of Dftn by Thf,G2,A47;then
reconsider q = dct.nm1, r = dct.(n+1)
as place of Dftn by ZFMISC_1:87,A56;
reconsider qt = [q,t] as S-T_arc of Dftn by Thf,G2,A47;
reconsider tr = [t,r] as T-S_arc of Dftn by Thf,G2,A47;
A50: q in rng dct by FUNCT_1:3,G3;
n+1 in dom dct by FINSEQ_3:25,A80,A82;then
A50a: r in rng dct by FUNCT_1:3;
A57: q <> r
proof
assume
A79: q = r;
per cases by XXREAL_0:1,A78;
suppose
A85: 1 = nm1;then
dct.len dct = r by Lm1,A79;
hence contradiction by A65a,Th10,A81,A74, A85;
end;
suppose
A86: 1 < nm1;
nm1 <> n+1;
hence contradiction by A86,A87,A80,A82,A65a,Th10,A79;
end;
end;
E1: now
let s be place of Dftn;
assume
D9: s in rng dct;
consider ns be object such that
D1: ns in dom dct & dct.ns = s by FUNCT_1:def 3,D9;
G5: dct.ns in places_of dct by D9,D1;
reconsider ns as Element of NAT by D1;
D2: 1 <= ns & ns <= len dct by D1,FINSEQ_3:25;
thus s <> r implies not s in {t}*'
proof
assume
D10: s <> r & s in {t}*';then
consider f being T-S_arc of Dftn, tt being transition of Dftn
such that
A61: tt in {t} & f = [tt,s] by PETRI:8;
per cases by D2,XXREAL_0:1;
suppose
A72: 1 = ns or ns = len dct;
reconsider lm1 = len dct - 1 as Element of NAT
by NAT_1:21,A21,XXREAL_0:2;
3 + (-1) < len dct + (-1) by A74,XREAL_1:8;then
D11: 1 < lm1 & lm1 <= len dct by XREAL_1:146,XXREAL_0:2;
[dct.lm1,dct.len dct] in the T-S_Arcs of Dftn by The; then
consider g be Element of the T-S_Arcs of Dftn such that
A63a: g = [dct.lm1,dct.len dct];
reconsider t1 = dct.lm1 as transition of Dftn
by ZFMISC_1:87,A63a;
g = [t1,s] by A63a,A72,Lm1,D1;then
dct.lm1 = tt by A61,Def1
.= dct.n by A47,TARSKI:def 1,A61;then
lm1 = n by A65a,Th10,D11,A62,A53;
hence contradiction by D10,D1,A72,Lm1;
end;
suppose
D6: 1 < ns & ns < len dct;then
1+1 <= ns by NAT_1:13;then
reconsider nsm2 = ns - 2 as Element of NAT by NAT_1:21;
reconsider nsm1 = ns - 1 as Element of NAT by NAT_1:21,D6;
A63: [dct.(ns-1),dct.ns] in the T-S_Arcs of Dftn by Thg,D6,G5;
reconsider g = [dct.(ns-1),dct.ns]
as Element of the T-S_Arcs of Dftn by Thg,D6,G5;
reconsider t1 = dct.(ns-1) as transition of Dftn
by ZFMISC_1:87,A63;
3 <= ns by Thg,D6,G5;then
3+(-1) <= ns + (-1) by XREAL_1:6;then
D8: 1 < ns-1 & ns-1 <= len dct by D6,XXREAL_0:2,XREAL_1:146;
g = [t1,s] by D1;then
dct.nsm1 = tt by A61,Def1 .= dct.n
by A47,TARSKI:def 1,A61;then
dct.(ns-1+1) = dct.(n+1) by A65a,Th10,D8,A62,A53;
hence contradiction by D1,D10;
end;
end;
thus s <> q implies not s in *'{t}
proof
assume
D10a: s <> q & s in *'{t};then
consider f being S-T_arc of Dftn, tt being transition of Dftn
such that
A61b: tt in {t} & f = [s,tt] by PETRI:6;
per cases by D2,XXREAL_0:1;
suppose
A72b: 1 = ns or ns = len dct;
[dct.1,dct.2] in the S-T_Arcs of Dftn by Thd;then
consider g be Element of the S-T_Arcs of Dftn such that
A63b: g = [dct.1,dct.2];
reconsider t1 = dct.2 as transition of Dftn
by ZFMISC_1:87,A63b;
g = [s,t1] by A63b,A72b,Lm1,D1;then
dct.2 = tt by A61b,Def1
.= dct.n by A47,TARSKI:def 1,A61b;then
2 = n by A65a,Th10,A62,A53,A53b;
hence contradiction by D10a,A72b,Lm1,D1;
end;
suppose
D6: 1 < ns & ns < len dct;then
A63bb: [dct.ns,dct.(ns+1)] in the S-T_Arcs of Dftn by Thg,G5;
reconsider g = [s,dct.(ns+1)]
as Element of the S-T_Arcs of Dftn by Thg,G5, D1,D6;
reconsider t1 = dct.(ns+1) as transition of Dftn
by ZFMISC_1:87,A63bb;
D8: 1 < ns+1 & ns+1 <= len dct by D6,NAT_1:13;
g = [s,t1];then
dct.(ns+1) = tt by A61b,Def1
.= dct.n by A47,TARSKI:def 1,A61b;then
ns+1 - 1 = n - 1 by A65a,Th10,D8,A62,A53;
hence contradiction by D1,D10a;
end;
end;
end;
E1con: for s being place of Dftn st s in rng dct
& s <> q & s <> r holds not s in *'{t} & not s in {t}*' by E1;
E1cona: for s being place of Dftn st s in rng dct &
s <> r & s <> q holds not s in *'{t} & not s in {t}*' by E1;
A59: qt = [q,t];
A58: t in {t} by TARSKI:def 1;then
A30a: q in *'{t} & not q in {t}*' by A59,A50,A57,E1;
A59a: tr = [t,r];
A30b: r in {t}*' & not r in *'{t} by A59a,A50a,A57,E1,A58;
set nq = q .. pl,nr = r .. pl,
nqm1 = nq -' 1, nrm1 = nr -' 1;
A44: len mM0 = len the Enumeration of P by Def12,K23
.= len mFM0 by Def12,K23;
q in P by A50;then
A32a: q in rng pl by RLAFFIN3:def 1;
r in P by A50a;then
A32: r in rng pl by RLAFFIN3:def 1;
gen: now
let n1,n2 be Element of NAT,
p1,p2 be place of Dftn;
assume
L3: n2 = p2 .. pl & n1 = p1 .. pl;
set n2m1 = n2 -' 1, n1m1 = n1 -' 1;
assume that
S1: n2 > n1 and
A32a: p1 in rng pl and
A32: p2 in rng pl and
L4: for s be place of Dftn st
s in rng dct & s <> p2 & s <> p1 holds
(not s in *'{t} & not s in {t}*') and
L5: p2 in *'{t} & not p2 in {t}*' & p1 in {t}*' & not p1 in *'{t}
or p1 in *'{t} & not p1 in {t}*' & p2 in {t}*' & not p2 in *'{t};
A39a: n2 in dom pl by FINSEQ_4:20,A32,L3;then
A40: 1 <= n2 & n2 <= len pl by FINSEQ_3:25; then
A36: n2 <= len mM0 by Def12,K23;then
A41: n2 in dom mM0 by FINSEQ_3:25,A40;
A43: n2m1 < n2 by XREAL_1:237,FINSEQ_3:25,A39a;
C18a: p2 = pl.n2 by FINSEQ_4:19,A32,L3;
C18: p1 = pl.n1 by FINSEQ_4:19,A32a,L3;
A39: n1 in dom pl by FINSEQ_4:20,A32a,L3;then
A37: 1 <= n1 by FINSEQ_3:25;
C19: n1 <= len pl by A39,FINSEQ_3:25;
C11: n1m1 < n1 by XREAL_1:237,FINSEQ_3:25,A39;
X12: n2m1+1>n1 by XREAL_1:235,FINSEQ_3:25,A39a,S1;then
A35: n2m1 >= n1 by NAT_1:13;then
C4: n1m1 < n2m1 by XXREAL_0:2,C11;
set mM0b2 = mM0 | n2m1,mFM0b2 = mFM0 | n2m1;
A27: mM0 = mM0b2 ^ <*mM0.n2*> ^ (mM0/^n2) by FINSEQ_5:84,A36,A40
.= mM0b2 ^ <*mM0/.n2*> ^ (mM0/^n2) by PARTFUN1:def 6,A41;
A36a: n2 <= len mFM0 by Def12,K23,A40;then
A41a: n2 in dom mFM0 by FINSEQ_3:25,A40;
A27a: mFM0 = mFM0b2 ^ <*mFM0.n2*> ^ (mFM0/^n2) by FINSEQ_5:84,A36a,A40
.= mFM0b2 ^ <*mFM0/.n2*> ^ (mFM0/^n2) by PARTFUN1:def 6,A41a;
F1: n2m1 <= len mM0 by A36,A43,XXREAL_0:2;
A42: len mM0b2 = n2m1 by FINSEQ_1:59,A36,A43,XXREAL_0:2;
A42a: len mFM0b2 = n2m1 by FINSEQ_1:59,A36a,A43,XXREAL_0:2;
A33a: n1 <= len mM0b2 by A35,FINSEQ_1:59,A36,A43,XXREAL_0:2;
A33: n1 <= len mFM0b2 by NAT_1:13,X12, A42a;then
A34: n1 in dom mFM0b2 by FINSEQ_3:25,A37;
A34a: n1 in dom mM0b2 by FINSEQ_3:25,A33a,A37;
n1 <= len mFM0 by S1,A36a,XXREAL_0:2;then
A31: n1 in dom mFM0 by FINSEQ_3:25,A37;
C12: n1 < len mM0 by XXREAL_0:2,A36,S1; then
A31b: n1 in dom mM0 by FINSEQ_3:25,A37;
G1: mM0b2 = (mM0b2 | n1m1) ^ <*mM0b2.n1*> ^ (mM0b2/^n1)
by FINSEQ_5:84,A33a,A37
.= (mM0b2 | n1m1) ^ <*mM0b2/.n1*> ^ (mM0b2/^n1)
by PARTFUN1:def 6,A34a;
G2: mFM0b2 = (mFM0b2 | n1m1)^<*mFM0b2.n1*>^(mFM0b2/^n1)
by FINSEQ_5:84,A33,A37
.= (mFM0b2 | n1m1) ^ <*mFM0b2/.n1*> ^ (mFM0b2/^n1)
by PARTFUN1:def 6,A34;
A29f: mM0b2/.n1 + 1+ mM0/.n2 -1 = mFM0b2/.n1 + mFM0/.n2
proof
A29g: mM0b2/.n1 = (mM0 | n2m1).n1 by PARTFUN1:def 6,A34a
.= mM0.n1 by FINSEQ_3:112,A35
.= M0.(pl.n1) by K23,Def12,A31b
.= M0.p1 by FINSEQ_4:19,A32a,L3;
A29h: FM0.p1 = FM0.(pl.n1) by FINSEQ_4:19,A32a,L3
.= mFM0.n1 by K23,Def12,A31
.= mFM0b2.n1 by FINSEQ_3:112,A35
.= mFM0b2/.n1 by PARTFUN1:def 6,A34;
A29i: mM0/.n2 = mM0.n2 by PARTFUN1:def 6,A41
.= M0.(pl.n2) by K23,Def12,A41
.= M0.p2 by FINSEQ_4:19,A32,L3;
A29j: FM0.p2 = FM0.(pl.n2) by FINSEQ_4:19,A32,L3
.= mFM0.n2 by K23,Def12,A41a
.= mFM0/.n2 by PARTFUN1:def 6,A41a;
per cases by L5;
suppose
A29k: p2 in *'{t} & not p2 in {t}*' & p1 in {t}*' & not p1 in *'{t};
A29m: mM0b2/.n1 + 1 = mFM0b2/.n1 by A29h,Def11,A29k,A10, A29g;
mM0/.n2 - 1 = mFM0/.n2 by A29j,A29i,Def11,A29k,A10;
hence thesis by A29m;
end;
suppose
A29l: p1 in *'{t} & not p1 in {t}*' & p2 in {t}*' & not p2 in *'{t};
A29n: mM0b2/.n1 - 1 = mFM0b2/.n1 by A29h,Def11,A29l,A10,A29g;
mM0/.n2 + 1 = mFM0/.n2 by A29j,Def11,A29l,A10,A29i;
hence thesis by A29n;
end;
end;
A29: mM0b2 | n1m1 = mFM0b2 | n1m1
proof
n1m1 <= len mM0b2 by FINSEQ_1:59,A36,A43,XXREAL_0:2,C4; then
C6: len (mM0b2 | n1m1) = n1m1 by FINSEQ_1:59;
len (mFM0b2 | n1m1)= n1m1
by FINSEQ_1:59,A42a,C11,XXREAL_0:2,A35;then
C1: dom (mM0b2 | n1m1) = dom (mFM0b2 | n1m1) by FINSEQ_3:29,C6;
now
let x be Element of NAT;
assume
C13: x in dom (mM0b2 | n1m1);then
C5: x <= n1m1 by C6,FINSEQ_3:25; then
C17: x < n1 by XXREAL_0:2,C11;then
C20: 1 <= x & x <= len mM0 by C12,XXREAL_0:2,C13,FINSEQ_3:25;then
C10: x in dom mM0 by FINSEQ_3:25;
C10a: x in dom mFM0 by A44,FINSEQ_3:25,C20;
x <= len pl by C17,C19,XXREAL_0:2;then
C21: x in dom pl by FINSEQ_3:25,C20;then
pl.x in rng pl by FUNCT_1:3;then
pl.x in P by RLAFFIN3:def 1;then
consider plx be place of Dftn such that
C15: plx = pl.x & plx in rng dct;
C16: plx <> p1 by FUNCT_1:def 4,C5,C11,A39,C18,C21,C15;
plx <> p2 by FUNCT_1:def 4,A39a,C18a,C21,C15,C17,S1;then
C14: not plx in *'{t} & not plx in {t}*' by L4,C15,C16;
thus (mM0b2 | n1m1).x = mM0b2.x by FINSEQ_3:112,C5
.= mM0.x by FINSEQ_3:112,XXREAL_0:2,C4,C5
.= M0.plx by K23,Def12,C15,C10
.= FM0.plx by Def11,C14,A10
.= mFM0.x by K23,Def12,C10a,C15
.= mFM0b2.x by FINSEQ_3:112,XXREAL_0:2,C4,C5
.= (mFM0b2 | n1m1).x by FINSEQ_3:112,C5;
end;
hence thesis by PARTFUN1:5,C1;
end;
A29b: mM0b2/^n1 = mFM0b2/^n1
proof
C6b: len (mM0b2/^n1) = n2m1 -n1 by RFINSEQ:def 1,A42, A35;
len (mFM0b2/^n1) = n2m1 -n1 by RFINSEQ:def 1,A35,A42a;then
C1b: dom (mM0b2/^n1) = dom (mFM0b2/^n1) by FINSEQ_3:29,C6b;
now
let x be Element of NAT;
assume
C13b: x in dom (mM0b2/^n1);then
C18b: 1 <= x & x <= len (mM0b2/^n1) by FINSEQ_3:25;then
C17b: 1+0 <= x+n1 by XREAL_1:7;
X13: x+n1 <= len (mM0b2/^n1) + n1 by XREAL_1:6,C18b;then
X14: x+n1 <= len mM0 by F1,XXREAL_0:2, C6b;then
C10b: x+n1 in dom mM0 by FINSEQ_3:25,C17b;
C10bb: x+n1 in dom mFM0 by A44,FINSEQ_3:25,C17b,X14;
x+n1 < n2 by XXREAL_0:2,A43,C6b,X13;then
x+n1 <= len pl by A40,XXREAL_0:2;then
C21b: x+n1 in dom pl by FINSEQ_3:25,C17b;then
pl.(x+n1) in rng pl by FUNCT_1:3;then
pl.(x+n1) in P by RLAFFIN3:def 1;then
consider plxpn1 be place of Dftn such that
C15b: plxpn1 = pl.(x+n1) & plxpn1 in rng dct;
C16b: plxpn1 <> p2 by FUNCT_1:def 4,A39a,C18a,C21b,C15b,A43,C6b,X13;
n1 + 0 < n1 + x by XREAL_1:29,C18b;then
plxpn1 <> p1 by FUNCT_1:def 4,A39,C18,C21b,C15b;then
C14b: not plxpn1 in *'{t} & not plxpn1 in {t}*' by L4,C16b,C15b;
thus (mM0b2/^n1).x = mM0b2.(x+n1) by RFINSEQ:def 1,C13b,A33a
.= mM0.(x+n1) by FINSEQ_3:112,C6b,X13
.= M0.plxpn1 by K23,Def12,C15b,C10b
.= FM0.plxpn1 by Def11,C14b,A10
.= mFM0.(x+n1) by K23,Def12,C10bb,C15b
.= mFM0b2.(x+n1) by FINSEQ_3:112,C6b,X13
.= (mFM0b2/^n1).x by RFINSEQ:def 1,C13b,C1b,A33;
end;
hence thesis by PARTFUN1:5,C1b;
end;
A29c: mM0/^n2 = mFM0/^n2
proof
C6c: len (mM0/^n2) = (len mM0) - n2 by RFINSEQ:def 1,A36;
len (mFM0/^n2)= (len mFM0) - n2 by RFINSEQ:def 1,A36a;then
C1c: dom (mM0/^n2) = dom (mFM0/^n2) by FINSEQ_3:29,A44,C6c;
now
let x be Element of NAT;
assume
C13c: x in dom (mM0/^n2);then
C18c: 1 <= x & x <= len (mM0/^n2) by FINSEQ_3:25;then
C17c: 1 + 0 <= x+n2 by XREAL_1:7;
X15: x+n2 <= len (mM0/^n2) + n2 by XREAL_1:6,C18c;then
C10cc: x+n2 in dom mFM0 by A44,FINSEQ_3:25,C17c,C6c;
C10c: x+n2 in dom mM0 by FINSEQ_3:25,C17c,C6c,X15;
C22: x+n2 > n2 by XREAL_1:29,C18c;
x+n2 <= len pl by Def12,K23,C6c,X15;then
C21c: x+n2 in dom pl by FINSEQ_3:25,C17c;then
pl.(x+n2) in rng pl by FUNCT_1:3;then
pl.(x+n2) in P by RLAFFIN3:def 1;then
consider plxpn2 be place of Dftn such that
C15c: plxpn2 = pl.(x+n2) & plxpn2 in rng dct;
C16c: plxpn2 <> p2 by FUNCT_1:def 4,A39a,C18a,C21c,C15c,C22;
n1 + 0 < n2 + x by XREAL_1:8,S1;then
plxpn2 <> p1 by FUNCT_1:def 4,A39,C18,C21c,C15c;then
C14c: not plxpn2 in *'{t} & not plxpn2 in {t}*' by L4,C16c,C15c;
thus (mM0/^n2).x = mM0.(x+n2) by RFINSEQ:def 1,A36,C13c
.= M0.plxpn2 by K23,Def12,C15c, C10c
.= FM0.plxpn2 by Def11,C14c,A10
.= mFM0.(x+n2) by K23,Def12,C10cc,C15c
.= (mFM0/^n2).x by RFINSEQ:def 1,C13c,C1c,A36a;
end;
hence thesis by PARTFUN1:5,C1c;
end;
thus num_marks(P, M0)
= Sum ((mM0b2 | n1m1) ^ <*mM0b2/.n1*> ^ (mM0b2/^n1)
^ <*mM0/.n2*>) + Sum (mM0/^n2) by RVSUM_1:75,G1,A27
.= Sum ((mM0b2 | n1m1) ^ <*mM0b2/.n1*> ^ (mM0b2/^n1))
+ Sum <*mM0/.n2*> + Sum (mM0/^n2) by RVSUM_1:75
.= Sum ((mM0b2 | n1m1) ^ <*mM0b2/.n1*>) + Sum (mM0b2/^n1)
+ Sum <*mM0/.n2*> + Sum (mM0/^n2) by RVSUM_1:75
.= Sum (mM0b2 | n1m1) + Sum <*mM0b2/.n1*> + Sum (mM0b2/^n1)
+ Sum <*mM0/.n2*> + Sum (mM0/^n2) by RVSUM_1:75
.= Sum (mM0b2 | n1m1) + Sum <*mM0b2/.n1*> + Sum (mM0b2/^n1)
+ mM0/.n2 + Sum (mM0/^n2) by RVSUM_1:73
.= Sum (mM0b2 | n1m1) + mM0b2/.n1 + Sum (mM0b2/^n1)
+ mM0/.n2 + Sum (mM0/^n2) by RVSUM_1:73
.= Sum (mFM0b2 | n1m1) + mFM0b2/.n1 + Sum (mFM0b2/^n1)
+ mFM0/.n2 + Sum (mFM0/^n2) by A29,A29b,A29c,A29f
.= Sum (mFM0b2 | n1m1) + Sum <*mFM0b2/.n1*> + Sum (mFM0b2/^n1)
+ mFM0/.n2 + Sum (mFM0/^n2) by RVSUM_1:73
.= Sum (mFM0b2 | n1m1) + Sum <*mFM0b2/.n1*> + Sum (mFM0b2/^n1)
+ Sum <*mFM0/.n2*> + Sum (mFM0/^n2) by RVSUM_1:73
.= Sum ((mFM0b2 | n1m1) ^ <*mFM0b2/.n1*>) + Sum (mFM0b2/^n1)
+ Sum <*mFM0/.n2*> + Sum (mFM0/^n2) by RVSUM_1:75
.= Sum ((mFM0b2 | n1m1) ^ <*mFM0b2/.n1*> ^ (mFM0b2/^n1))
+ Sum <*mFM0/.n2*> + Sum (mFM0/^n2) by RVSUM_1:75
.= Sum ((mFM0b2 | n1m1) ^ <*mFM0b2/.n1*> ^ (mFM0b2/^n1)
^ <*mFM0/.n2*>) + Sum (mFM0/^n2) by RVSUM_1:75
.= num_marks(P, Firing(t, M0)) by RVSUM_1:75, A27a,G2;
end;
nq <> nr
proof
assume
A59: nq = nr;
q = pl.nr by A59,FINSEQ_4:19,A32a
.= r by FINSEQ_4:19,A32;
hence contradiction by A57;
end;then
per cases by XXREAL_0:1;
suppose
nq > nr;
hence num_marks(P, M0) = num_marks(P, Firing(t, M0))
by gen,A32,A32a,E1con,A30a,A30b;
end;
suppose
nr > nq;
hence num_marks(P, M0) = num_marks(P, Firing(t, M0))
by gen,A32,A32a,E1cona,A30a,A30b;
end;
end;
end;
suppose
A9: not t in transitions_of dct;
set EF = the Enumeration of Firing(t, M0),P,
E = the Enumeration of M0, P;
A15: len EF = len the Enumeration of P by Def12,K23;
len the Enumeration of P = len E by Def12,K23;then
A4: dom EF = dom E by FINSEQ_3:29,A15;
now
let x be Element of NAT;
assume
A6: x in dom EF; then
x in dom the Enumeration of P by FINSEQ_3:29,A15;then
A18: (the Enumeration of P).x in rng the Enumeration of P
by FUNCT_1:3;then
reconsider s = (the Enumeration of P).x as place of Dftn;
A14: s in P by RLAFFIN3:def 1,A18;
A7: now
assume s in *'{t} & not s in {t}*';then
consider f being S-T_arc of Dftn,t1 being transition of Dftn
such that
A13: t1 in {t} & f = [s,t1] by PETRI:6;
t1 = t by TARSKI:def 1,A13;
hence contradiction by A9,Thb,A14, A13;
end;
P1: now
assume s in {t}*' & not s in *'{t};then
consider f being T-S_arc of Dftn,t1 being transition of Dftn
such that
A13a: t1 in {t} & f = [t1,s] by PETRI:8;
t1 = t by TARSKI:def 1,A13a;
hence contradiction by A9,Thb,A14,A13a;
end;
thus EF.x = (Firing(t,M0)).s by Def12,K23,A6
.= M0.((the Enumeration of P).x) by A10,Def11,A7,P1
.= E.x by Def12,K23,A6,A4;
end;
hence num_marks(P, Firing(t, M0)) = num_marks(P, M0) by PARTFUN1:5,A4;
end;
end;
suppose not t is_firable_at M0;
hence thesis by Def11;
end;
end;
theorem
for Dftn being Decision_free_PT,
dct being Circuit_of_places_and_trans of Dftn,
M0 being marking of Dftn, Q being FinSequence of the carrier' of Dftn holds
num_marks(places_of dct, M0) = num_marks(places_of dct, Firing(Q, M0))
proof
let Dftn be With_directed_circuit Petri Decision_free_PT,
dct be Circuit_of_places_and_trans of Dftn,
M0 be marking of Dftn,
Q be FinSequence of the carrier' of Dftn;
set P = places_of dct, F = Firing(Q, M0);
per cases;
suppose
C1: Q <> {};then
consider M being FinSequence of nat_marks_of Dftn such that
A2: len Q = len M and
A2a: F = M/.len M and
A2b: M/.1 = Firing(Q/.1, M0) and
A2c: for i st i < len Q & i > 0
holds M/.(i+1) = Firing(Q/.(i+1),M/.i) by Defb;
defpred R[Nat] means 1<=$1 & $1 <= len Q implies
num_marks(P,M/.1) = num_marks(P,M/.$1);
A5: R[0];
A4: now
let i;
assume
A10: R[i];
thus R[i+1]
proof
assume
A9: 1 <= i+1 & i+1 <= len Q;then
X1: i < len Q by NAT_1:13;
per cases;
suppose 0 = i;
hence num_marks(P,M/.1) = num_marks(P,M/.(i+1));
end;
suppose
S2: 0 < i;then
0 + 1 <= i by NAT_1:13;
hence num_marks(P,M/.1)
= num_marks(P,Firing(Q/.(i+1),M/.i)) by Th7,A10,NAT_1:13,A9
.= num_marks(P,M/.(i+1)) by A2c,S2,X1;
end;
end;
end;
A6: for i holds R[i] from NAT_1:sch 2(A5,A4);
0+1 <= len Q by NAT_1:13,C1;then
num_marks(P,M/.1) = num_marks(P,M/.len M) by A2, A6;
hence num_marks(P, M0) = num_marks(P, Firing(Q, M0)) by A2a,A2b,Th7;
end;
suppose Q = {};
hence thesis by Defb;
end;
end;