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Theorem wlk1walkdom 16805
Description: A walk is a 1-walk "on the edge level" according to Aksoy et al. (Contributed by AV, 30-Dec-2020.)
Hypothesis
Ref Expression
wlk1walk.i  |-  I  =  (iEdg `  G )
Assertion
Ref Expression
wlk1walkdom  |-  ( F (Walks `  G ) P  ->  A. k  e.  ( 1..^ (♯ `  F
) ) 1o  ~<_  ( ( I `  ( F `
 ( k  - 
1 ) ) )  i^i  ( I `  ( F `  k ) ) ) )
Distinct variable groups:    k, F    k, G    P, k
Allowed substitution hint:    I( k)

Proof of Theorem wlk1walkdom
Dummy variable  i is distinct from all other variables.
StepHypRef Expression
1 wlk1walk.i . . . . . . 7  |-  I  =  (iEdg `  G )
2 wlkv 16772 . . . . . . . . 9  |-  ( F (Walks `  G ) P  ->  ( G  e. 
_V  /\  F  e.  _V  /\  P  e.  _V ) )
32simp1d 1040 . . . . . . . 8  |-  ( F (Walks `  G ) P  ->  G  e.  _V )
4 iedgex 16465 . . . . . . . 8  |-  ( G  e.  _V  ->  (iEdg `  G )  e.  _V )
53, 4syl 14 . . . . . . 7  |-  ( F (Walks `  G ) P  ->  (iEdg `  G
)  e.  _V )
61, 5eqeltrid 2325 . . . . . 6  |-  ( F (Walks `  G ) P  ->  I  e.  _V )
76adantr 276 . . . . 5  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  ->  I  e.  _V )
82simp2d 1041 . . . . . . 7  |-  ( F (Walks `  G ) P  ->  F  e.  _V )
98adantr 276 . . . . . 6  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  ->  F  e.  _V )
10 elfzoelz 10571 . . . . . . . 8  |-  ( k  e.  ( 1..^ (♯ `  F ) )  -> 
k  e.  ZZ )
1110adantl 277 . . . . . . 7  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
k  e.  ZZ )
12 peano2zm 9693 . . . . . . 7  |-  ( k  e.  ZZ  ->  (
k  -  1 )  e.  ZZ )
1311, 12syl 14 . . . . . 6  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( k  -  1 )  e.  ZZ )
14 fvexg 5717 . . . . . 6  |-  ( ( F  e.  _V  /\  ( k  -  1 )  e.  ZZ )  ->  ( F `  ( k  -  1 ) )  e.  _V )
159, 13, 14syl2anc 415 . . . . 5  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( F `  (
k  -  1 ) )  e.  _V )
16 fvexg 5717 . . . . 5  |-  ( ( I  e.  _V  /\  ( F `  ( k  -  1 ) )  e.  _V )  -> 
( I `  ( F `  ( k  -  1 ) ) )  e.  _V )
177, 15, 16syl2anc 415 . . . 4  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( I `  ( F `  ( k  -  1 ) ) )  e.  _V )
18 inex1g 4271 . . . 4  |-  ( ( I `  ( F `
 ( k  - 
1 ) ) )  e.  _V  ->  (
( I `  ( F `  ( k  -  1 ) ) )  i^i  ( I `
 ( F `  k ) ) )  e.  _V )
1917, 18syl 14 . . 3  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( I `  ( F `  ( k  -  1 ) ) )  i^i  ( I `
 ( F `  k ) ) )  e.  _V )
20 eqid 2238 . . . . . . . 8  |-  (Vtx `  G )  =  (Vtx
`  G )
21 eqid 2238 . . . . . . . 8  |-  (iEdg `  G )  =  (iEdg `  G )
2220, 21wlkprop 16773 . . . . . . 7  |-  ( F (Walks `  G ) P  ->  ( F  e. Word  dom  (iEdg `  G )  /\  P : ( 0 ... (♯ `  F
) ) --> (Vtx `  G )  /\  A. i  e.  ( 0..^ (♯ `  F )
)if- ( ( P `
 i )  =  ( P `  (
i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i )
)  =  { ( P `  i ) } ,  { ( P `  i ) ,  ( P `  ( i  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  i
) ) ) ) )
2322simp3d 1042 . . . . . 6  |-  ( F (Walks `  G ) P  ->  A. i  e.  ( 0..^ (♯ `  F
) )if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i
) )  =  {
( P `  i
) } ,  {
( P `  i
) ,  ( P `
 ( i  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  i )
) ) )
24 elfzofz 10587 . . . . . . 7  |-  ( k  e.  ( 1..^ (♯ `  F ) )  -> 
k  e.  ( 1 ... (♯ `  F
) ) )
25 fz1fzo0m1 10618 . . . . . . 7  |-  ( k  e.  ( 1 ... (♯ `  F )
)  ->  ( k  -  1 )  e.  ( 0..^ (♯ `  F
) ) )
26 wkslem1 16766 . . . . . . . 8  |-  ( i  =  ( k  - 
1 )  ->  (if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i )
)  =  { ( P `  i ) } ,  { ( P `  i ) ,  ( P `  ( i  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  i
) ) )  <-> if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  - 
1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 ( ( k  -  1 )  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
2726rspcv 2925 . . . . . . 7  |-  ( ( k  -  1 )  e.  ( 0..^ (♯ `  F ) )  -> 
( A. i  e.  ( 0..^ (♯ `  F
) )if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i
) )  =  {
( P `  i
) } ,  {
( P `  i
) ,  ( P `
 ( i  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  i )
) )  -> if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  - 
1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 ( ( k  -  1 )  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
2824, 25, 273syl 17 . . . . . 6  |-  ( k  e.  ( 1..^ (♯ `  F ) )  -> 
( A. i  e.  ( 0..^ (♯ `  F
) )if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i
) )  =  {
( P `  i
) } ,  {
( P `  i
) ,  ( P `
 ( i  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  i )
) )  -> if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  - 
1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 ( ( k  -  1 )  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
2923, 28mpan9 281 . . . . 5  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) ) )
30 fzo0ss1 10600 . . . . . . . . 9  |-  ( 1..^ (♯ `  F )
)  C_  ( 0..^ (♯ `  F )
)
3130sseli 3244 . . . . . . . 8  |-  ( k  e.  ( 1..^ (♯ `  F ) )  -> 
k  e.  ( 0..^ (♯ `  F )
) )
32 wkslem1 16766 . . . . . . . . 9  |-  ( i  =  k  ->  (if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i )
)  =  { ( P `  i ) } ,  { ( P `  i ) ,  ( P `  ( i  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  i
) ) )  <-> if- ( ( P `  k )  =  ( P `  ( k  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } ,  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) ) ) )
3332rspcv 2925 . . . . . . . 8  |-  ( k  e.  ( 0..^ (♯ `  F ) )  -> 
( A. i  e.  ( 0..^ (♯ `  F
) )if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i
) )  =  {
( P `  i
) } ,  {
( P `  i
) ,  ( P `
 ( i  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  i )
) )  -> if- ( ( P `  k )  =  ( P `  ( k  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } ,  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) ) ) )
3431, 33syl 14 . . . . . . 7  |-  ( k  e.  ( 1..^ (♯ `  F ) )  -> 
( A. i  e.  ( 0..^ (♯ `  F
) )if- ( ( P `  i )  =  ( P `  ( i  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  i
) )  =  {
( P `  i
) } ,  {
( P `  i
) ,  ( P `
 ( i  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  i )
) )  -> if- ( ( P `  k )  =  ( P `  ( k  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } ,  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) ) ) )
3523, 34mpan9 281 . . . . . 6  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> if- ( ( P `  k )  =  ( P `  ( k  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } ,  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )
36 df-ifp 991 . . . . . . 7  |-  (if- ( ( P `  k
)  =  ( P `
 ( k  +  1 ) ) ,  ( (iEdg `  G
) `  ( F `  k ) )  =  { ( P `  k ) } ,  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k )
) )  <->  ( (
( P `  k
)  =  ( P `
 ( k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  \/  ( -.  ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) ) )
37 zcn 9660 . . . . . . . . . . 11  |-  ( k  e.  ZZ  ->  k  e.  CC )
38 eqidd 2239 . . . . . . . . . . . 12  |-  ( k  e.  CC  ->  (
k  -  1 )  =  ( k  - 
1 ) )
39 npcan1 8712 . . . . . . . . . . . 12  |-  ( k  e.  CC  ->  (
( k  -  1 )  +  1 )  =  k )
40 wkslem2 16767 . . . . . . . . . . . 12  |-  ( ( ( k  -  1 )  =  ( k  -  1 )  /\  ( ( k  - 
1 )  +  1 )  =  k )  ->  (if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  - 
1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 ( ( k  -  1 )  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  <-> if- ( ( P `  ( k  -  1 ) )  =  ( P `  k ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
4138, 39, 40syl2anc 415 . . . . . . . . . . 11  |-  ( k  e.  CC  ->  (if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  <-> if- ( ( P `  ( k  -  1 ) )  =  ( P `  k ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
4210, 37, 413syl 17 . . . . . . . . . 10  |-  ( k  e.  ( 1..^ (♯ `  F ) )  -> 
(if- ( ( P `
 ( k  - 
1 ) )  =  ( P `  (
( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  <-> if- ( ( P `  ( k  -  1 ) )  =  ( P `  k ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
4342adantl 277 . . . . . . . . 9  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
(if- ( ( P `
 ( k  - 
1 ) )  =  ( P `  (
( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  <-> if- ( ( P `  ( k  -  1 ) )  =  ( P `  k ) ,  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ,  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) ) ) )
44 df-ifp 991 . . . . . . . . . 10  |-  (if- ( ( P `  (
k  -  1 ) )  =  ( P `
 k ) ,  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  <->  ( (
( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } )  \/  ( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) ) ) )
45 anass 405 . . . . . . . . . . . . . . 15  |-  ( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  /\  (
( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ) )  <-> 
( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  ( ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) }  /\  ( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ) ) ) )
46 sneq 3720 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( P `  ( k  -  1 ) )  =  ( P `  k )  ->  { ( P `  ( k  -  1 ) ) }  =  { ( P `  k ) } )
4746eqeq2d 2250 . . . . . . . . . . . . . . . . . . 19  |-  ( ( P `  ( k  -  1 ) )  =  ( P `  k )  ->  (
( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) }  <->  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  k ) } ) )
4847biimpa 296 . . . . . . . . . . . . . . . . . 18  |-  ( ( ( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } )  -> 
( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  k ) } )
492simp3d 1042 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( F (Walks `  G ) P  ->  P  e.  _V )
5049adantr 276 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  ->  P  e.  _V )
51 vex 2824 . . . . . . . . . . . . . . . . . . . . . 22  |-  k  e. 
_V
52 fvexg 5717 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( P  e.  _V  /\  k  e.  _V )  ->  ( P `  k
)  e.  _V )
5350, 51, 52sylancl 417 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( P `  k
)  e.  _V )
54 snidg 3738 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( P `  k )  e.  _V  ->  ( P `  k )  e.  { ( P `  k ) } )
5553, 54syl 14 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( P `  k
)  e.  { ( P `  k ) } )
561fveq1i 5699 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( I `
 ( F `  ( k  -  1 ) ) )  =  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )
5756eleq2i 2305 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  <->  ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )
58 eleq2 2302 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  k
) }  ->  (
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  <->  ( P `  k )  e.  {
( P `  k
) } ) )
5957, 58bitrid 192 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  k
) }  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  <->  ( P `  k )  e.  {
( P `  k
) } ) )
6055, 59syl5ibrcom 157 . . . . . . . . . . . . . . . . . . 19  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  k ) }  ->  ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) ) ) )
6155adantr 276 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  -> 
( P `  k
)  e.  { ( P `  k ) } )
62 eleq2 2302 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) }  ->  (
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  k )
)  <->  ( P `  k )  e.  {
( P `  k
) } ) )
6362adantl 277 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  -> 
( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  k
) )  <->  ( P `  k )  e.  {
( P `  k
) } ) )
6461, 63mpbird 167 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  -> 
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  k )
) )
651fveq1i 5699 . . . . . . . . . . . . . . . . . . . . 21  |-  ( I `
 ( F `  k ) )  =  ( (iEdg `  G
) `  ( F `  k ) )
6664, 65eleqtrrdi 2332 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  -> 
( P `  k
)  e.  ( I `
 ( F `  k ) ) )
6766ex 115 . . . . . . . . . . . . . . . . . . 19  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) }  ->  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) )
6860, 67anim12d 335 . . . . . . . . . . . . . . . . . 18  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  k ) }  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) )
6948, 68sylani 410 . . . . . . . . . . . . . . . . 17  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } )  /\  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
7069ancomsd 269 . . . . . . . . . . . . . . . 16  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) }  /\  ( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ) )  ->  ( ( P `
 k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) )
7170adantld 278 . . . . . . . . . . . . . . 15  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  ( ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) }  /\  (
( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } ) ) )  ->  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) )
7245, 71biimtrid 152 . . . . . . . . . . . . . 14  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  /\  ( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
7372expd 258 . . . . . . . . . . . . 13  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  ->  (
( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
7411peano2zd 9782 . . . . . . . . . . . . . . . . . . . . . . . 24  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( k  +  1 )  e.  ZZ )
75 fvexg 5717 . . . . . . . . . . . . . . . . . . . . . . . 24  |-  ( ( P  e.  _V  /\  ( k  +  1 )  e.  ZZ )  ->  ( P `  ( k  +  1 ) )  e.  _V )
7650, 74, 75syl2anc 415 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( P `  (
k  +  1 ) )  e.  _V )
77 prssg 3872 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( ( ( P `  k
)  e.  _V  /\  ( P `  ( k  +  1 ) )  e.  _V )  -> 
( ( ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  k ) )  /\  ( P `  ( k  +  1 ) )  e.  ( (iEdg `  G ) `  ( F `  k )
) )  <->  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )
7853, 76, 77syl2anc 415 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  k ) )  /\  ( P `  ( k  +  1 ) )  e.  ( (iEdg `  G ) `  ( F `  k )
) )  <->  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )
7978biimpar 297 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  (
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  k )
)  /\  ( P `  ( k  +  1 ) )  e.  ( (iEdg `  G ) `  ( F `  k
) ) ) )
8079simpld 112 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  ( P `  k )  e.  ( (iEdg `  G
) `  ( F `  k ) ) )
811eqcomi 2242 . . . . . . . . . . . . . . . . . . . . . . 23  |-  (iEdg `  G )  =  I
8281fveq1i 5699 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( (iEdg `  G ) `  ( F `  k )
)  =  ( I `
 ( F `  k ) )
8382eleq2i 2305 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  k )
)  <->  ( P `  k )  e.  ( I `  ( F `
 k ) ) )
8483biimpi 120 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  k )
)  ->  ( P `  k )  e.  ( I `  ( F `
 k ) ) )
8580, 84syl 14 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  ( P `  k )  e.  ( I `  ( F `  k )
) )
8685ex 115 . . . . . . . . . . . . . . . . . 18  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( { ( P `
 k ) ,  ( P `  (
k  +  1 ) ) }  C_  (
(iEdg `  G ) `  ( F `  k
) )  ->  ( P `  k )  e.  ( I `  ( F `  k )
) ) )
8760, 86anim12d 335 . . . . . . . . . . . . . . . . 17  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  k ) }  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
8887expd 258 . . . . . . . . . . . . . . . 16  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  k ) }  ->  ( {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
)  ->  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
8948, 88syl5 32 . . . . . . . . . . . . . . 15  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } )  ->  ( { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k )
)  ->  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
9089com23 78 . . . . . . . . . . . . . 14  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( { ( P `
 k ) ,  ( P `  (
k  +  1 ) ) }  C_  (
(iEdg `  G ) `  ( F `  k
) )  ->  (
( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
9190adantld 278 . . . . . . . . . . . . 13  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( -.  ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  (
( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
9273, 91jaod 729 . . . . . . . . . . . 12  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  \/  ( -.  ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )  ->  ( ( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
9392com23 78 . . . . . . . . . . 11  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } )  ->  (
( ( ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  \/  ( -.  ( P `  k
)  =  ( P `
 ( k  +  1 ) )  /\  { ( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
94 fvexg 5717 . . . . . . . . . . . . . . . . . . 19  |-  ( ( P  e.  _V  /\  ( k  -  1 )  e.  ZZ )  ->  ( P `  ( k  -  1 ) )  e.  _V )
9550, 13, 94syl2anc 415 . . . . . . . . . . . . . . . . . 18  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( P `  (
k  -  1 ) )  e.  _V )
96 prssg 3872 . . . . . . . . . . . . . . . . . 18  |-  ( ( ( P `  (
k  -  1 ) )  e.  _V  /\  ( P `  k )  e.  _V )  -> 
( ( ( P `
 ( k  - 
1 ) )  e.  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  <->  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) ) )
9795, 53, 96syl2anc 415 . . . . . . . . . . . . . . . . 17  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 ( k  - 
1 ) )  e.  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  <->  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) ) )
9881fveq1i 5699 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  ( I `
 ( F `  ( k  -  1 ) ) )
9998eleq2i 2305 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  <->  ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) ) )
10099biimpi 120 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  ->  ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) ) )
101100a1i 9 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  ->  ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) ) ) )
102101, 67anim12d 335 . . . . . . . . . . . . . . . . . . 19  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  /\  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
103102expd 258 . . . . . . . . . . . . . . . . . 18  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  ->  (
( (iEdg `  G
) `  ( F `  k ) )  =  { ( P `  k ) }  ->  ( ( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
104103adantld 278 . . . . . . . . . . . . . . . . 17  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 ( k  - 
1 ) )  e.  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( (iEdg `  G
) `  ( F `  k ) )  =  { ( P `  k ) }  ->  ( ( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
10597, 104sylbird 170 . . . . . . . . . . . . . . . 16  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( { ( P `
 ( k  - 
1 ) ) ,  ( P `  k
) }  C_  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  ->  (
( (iEdg `  G
) `  ( F `  k ) )  =  { ( P `  k ) }  ->  ( ( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
106105adantld 278 . . . . . . . . . . . . . . 15  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( -.  ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( (iEdg `  G
) `  ( F `  k ) )  =  { ( P `  k ) }  ->  ( ( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
107106com23 78 . . . . . . . . . . . . . 14  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) }  ->  ( ( -.  ( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  { ( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
108107adantld 278 . . . . . . . . . . . . 13  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  ->  (
( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
10999, 83anbi12i 464 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( ( ( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  k ) ) )  <-> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) )
110109biimpi 120 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( ( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  k ) ) )  ->  ( ( P `
 k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) )
111110ex 115 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  ->  ( ( P `  k )  e.  ( (iEdg `  G
) `  ( F `  k ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
112111adantl 277 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( ( P `  (
k  -  1 ) )  e.  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  ( k  -  1 ) ) ) )  ->  ( ( P `
 k )  e.  ( (iEdg `  G
) `  ( F `  k ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
11397, 112biimtrrdi 164 . . . . . . . . . . . . . . . . . . 19  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( { ( P `
 ( k  - 
1 ) ) ,  ( P `  k
) }  C_  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  ->  (
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  k )
)  ->  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
114113adantld 278 . . . . . . . . . . . . . . . . . 18  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( -.  ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  k )
)  ->  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
115114com23 78 . . . . . . . . . . . . . . . . 17  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( P `  k )  e.  ( (iEdg `  G ) `  ( F `  k
) )  ->  (
( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
116115adantr 276 . . . . . . . . . . . . . . . 16  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  (
( P `  k
)  e.  ( (iEdg `  G ) `  ( F `  k )
)  ->  ( ( -.  ( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  { ( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
11780, 116mpd 13 . . . . . . . . . . . . . . 15  |-  ( ( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  (
( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
118117ex 115 . . . . . . . . . . . . . 14  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( { ( P `
 k ) ,  ( P `  (
k  +  1 ) ) }  C_  (
(iEdg `  G ) `  ( F `  k
) )  ->  (
( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
119118adantld 278 . . . . . . . . . . . . 13  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( -.  ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  {
( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  (
( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
120108, 119jaod 729 . . . . . . . . . . . 12  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  \/  ( -.  ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )  ->  ( ( -.  ( P `  (
k  -  1 ) )  =  ( P `
 k )  /\  { ( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( P `  k
)  e.  ( I `
 ( F `  ( k  -  1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `  k ) ) ) ) ) )
121120com23 78 . . . . . . . . . . 11  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( -.  ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  {
( P `  (
k  -  1 ) ) ,  ( P `
 k ) } 
C_  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) ) )  ->  (
( ( ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  \/  ( -.  ( P `  k
)  =  ( P `
 ( k  +  1 ) )  /\  { ( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
12293, 121jaod 729 . . . . . . . . . 10  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( ( ( P `  ( k  -  1 ) )  =  ( P `  k )  /\  (
(iEdg `  G ) `  ( F `  (
k  -  1 ) ) )  =  {
( P `  (
k  -  1 ) ) } )  \/  ( -.  ( P `
 ( k  - 
1 ) )  =  ( P `  k
)  /\  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) ) )  ->  ( ( ( ( P `  k
)  =  ( P `
 ( k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  \/  ( -.  ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )  ->  ( ( P `
 k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
12344, 122biimtrid 152 . . . . . . . . 9  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
(if- ( ( P `
 ( k  - 
1 ) )  =  ( P `  k
) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  k ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  \/  ( -.  ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )  ->  ( ( P `
 k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
12443, 123sylbid 150 . . . . . . . 8  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
(if- ( ( P `
 ( k  - 
1 ) )  =  ( P `  (
( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  (
(iEdg `  G ) `  ( F `  k
) )  =  {
( P `  k
) } )  \/  ( -.  ( P `
 k )  =  ( P `  (
k  +  1 ) )  /\  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k
) ) ) )  ->  ( ( P `
 k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) ) ) )
125124com3r 79 . . . . . . 7  |-  ( ( ( ( P `  k )  =  ( P `  ( k  +  1 ) )  /\  ( (iEdg `  G ) `  ( F `  k )
)  =  { ( P `  k ) } )  \/  ( -.  ( P `  k
)  =  ( P `
 ( k  +  1 ) )  /\  { ( P `  k
) ,  ( P `
 ( k  +  1 ) ) } 
C_  ( (iEdg `  G ) `  ( F `  k )
) ) )  -> 
( ( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  ->  (if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
12636, 125sylbi 121 . . . . . 6  |-  (if- ( ( P `  k
)  =  ( P `
 ( k  +  1 ) ) ,  ( (iEdg `  G
) `  ( F `  k ) )  =  { ( P `  k ) } ,  { ( P `  k ) ,  ( P `  ( k  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  k )
) )  ->  (
( F (Walks `  G ) P  /\  k  e.  ( 1..^ (♯ `  F )
) )  ->  (if- ( ( P `  ( k  -  1 ) )  =  ( P `  ( ( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) ) )
12735, 126mpcom 36 . . . . 5  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
(if- ( ( P `
 ( k  - 
1 ) )  =  ( P `  (
( k  -  1 )  +  1 ) ) ,  ( (iEdg `  G ) `  ( F `  ( k  -  1 ) ) )  =  { ( P `  ( k  -  1 ) ) } ,  { ( P `  ( k  -  1 ) ) ,  ( P `  ( ( k  - 
1 )  +  1 ) ) }  C_  ( (iEdg `  G ) `  ( F `  (
k  -  1 ) ) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) ) )
12829, 127mpd 13 . . . 4  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( ( P `  k )  e.  ( I `  ( F `
 ( k  - 
1 ) ) )  /\  ( P `  k )  e.  ( I `  ( F `
 k ) ) ) )
129 elin 3412 . . . 4  |-  ( ( P `  k )  e.  ( ( I `
 ( F `  ( k  -  1 ) ) )  i^i  ( I `  ( F `  k )
) )  <->  ( ( P `  k )  e.  ( I `  ( F `  ( k  -  1 ) ) )  /\  ( P `
 k )  e.  ( I `  ( F `  k )
) ) )
130128, 129sylibr 134 . . 3  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  -> 
( P `  k
)  e.  ( ( I `  ( F `
 ( k  - 
1 ) ) )  i^i  ( I `  ( F `  k ) ) ) )
131 dom1oi 7121 . . 3  |-  ( ( ( ( I `  ( F `  ( k  -  1 ) ) )  i^i  ( I `
 ( F `  k ) ) )  e.  _V  /\  ( P `  k )  e.  ( ( I `  ( F `  ( k  -  1 ) ) )  i^i  ( I `
 ( F `  k ) ) ) )  ->  1o  ~<_  ( ( I `  ( F `
 ( k  - 
1 ) ) )  i^i  ( I `  ( F `  k ) ) ) )
13219, 130, 131syl2anc 415 . 2  |-  ( ( F (Walks `  G
) P  /\  k  e.  ( 1..^ (♯ `  F
) ) )  ->  1o 
~<_  ( ( I `  ( F `  ( k  -  1 ) ) )  i^i  ( I `
 ( F `  k ) ) ) )
133132ralrimiva 2623 1  |-  ( F (Walks `  G ) P  ->  A. k  e.  ( 1..^ (♯ `  F
) ) 1o  ~<_  ( ( I `  ( F `
 ( k  - 
1 ) ) )  i^i  ( I `  ( F `  k ) ) ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 720  if-wif 990    = wceq 1402    e. wcel 2209   A.wral 2528   _Vcvv 2821    i^i cin 3219    C_ wss 3220   {csn 3709   {cpr 3710   class class class wbr 4131   dom cdm 4776   -->wf 5376   ` cfv 5380  (class class class)co 6088   1oc1o 6684    ~<_ cdom 7025   CCcc 8183   0cc0 8185   1c1 8186    + caddc 8188    - cmin 8504   ZZcz 9655   ...cfz 10428  ..^cfzo 10566  ♯chash 11236  Word cword 11326  Vtxcvtx 16458  iEdgciedg 16459  Walkscwlks 16763
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4248  ax-sep 4251  ax-nul 4261  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-setind 4686  ax-iinf 4737  ax-cnex 8276  ax-resscn 8277  ax-1cn 8278  ax-1re 8279  ax-icn 8280  ax-addcl 8281  ax-addrcl 8282  ax-mulcl 8283  ax-addcom 8285  ax-mulcom 8286  ax-addass 8287  ax-mulass 8288  ax-distr 8289  ax-i2m1 8290  ax-0lt1 8291  ax-1rid 8292  ax-0id 8293  ax-rnegex 8294  ax-cnre 8296  ax-pre-ltirr 8297  ax-pre-ltwlin 8298  ax-pre-lttrn 8299  ax-pre-apti 8300  ax-pre-ltadd 8301
This proof depends on definitions:  df-bi 117  df-dc 847  df-ifp 991  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4132  df-opab 4194  df-mpt 4195  df-tr 4232  df-id 4440  df-iord 4513  df-on 4515  df-ilim 4516  df-suc 4518  df-iom 4740  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-f1 5385  df-fo 5386  df-f1o 5387  df-fv 5388  df-riota 6041  df-ov 6091  df-oprab 6092  df-mpo 6093  df-1st 6378  df-2nd 6379  df-recs 6580  df-frec 6666  df-1o 6691  df-er 6811  df-map 6928  df-en 7027  df-dom 7028  df-fin 7029  df-pnf 8368  df-mnf 8369  df-xr 8370  df-ltxr 8371  df-le 8372  df-sub 8506  df-neg 8507  df-inn 9314  df-2 9372  df-3 9373  df-4 9374  df-5 9375  df-6 9376  df-7 9377  df-8 9378  df-9 9379  df-n0 9575  df-z 9656  df-dec 9789  df-uz 9938  df-fz 10429  df-fzo 10567  df-ihash 11237  df-word 11327  df-ndx 13413  df-slot 13414  df-base 13416  df-edgf 16451  df-vtx 16460  df-iedg 16461  df-wlks 16764
This theorem is used by: (None)
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