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Theorem iscycl 25345
Description: Properties of a pair of functions to be a cycle (in an undirected graph). (Contributed by Alexander van der Vekens, 30-Oct-2017.)
Assertion
Ref Expression
iscycl  |-  ( ( ( V  e.  X  /\  E  e.  Y
)  /\  ( F  e.  W  /\  P  e.  Z ) )  -> 
( F ( V Cycles  E ) P  <->  ( F
( V Paths  E ) P  /\  ( P ` 
0 )  =  ( P `  ( # `  F ) ) ) ) )

Proof of Theorem iscycl
Dummy variables  f  p are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cycls 25343 . . 3  |-  ( ( V  e.  X  /\  E  e.  Y )  ->  ( V Cycles  E )  =  { <. f ,  p >.  |  (
f ( V Paths  E
) p  /\  (
p `  0 )  =  ( p `  ( # `  f ) ) ) } )
2 fveq1 5878 . . . . 5  |-  ( p  =  P  ->  (
p `  0 )  =  ( P ` 
0 ) )
32adantl 468 . . . 4  |-  ( ( f  =  F  /\  p  =  P )  ->  ( p `  0
)  =  ( P `
 0 ) )
4 simpr 463 . . . . 5  |-  ( ( f  =  F  /\  p  =  P )  ->  p  =  P )
5 fveq2 5879 . . . . . 6  |-  ( f  =  F  ->  ( # `
 f )  =  ( # `  F
) )
65adantr 467 . . . . 5  |-  ( ( f  =  F  /\  p  =  P )  ->  ( # `  f
)  =  ( # `  F ) )
74, 6fveq12d 5885 . . . 4  |-  ( ( f  =  F  /\  p  =  P )  ->  ( p `  ( # `
 f ) )  =  ( P `  ( # `  F ) ) )
83, 7eqeq12d 2445 . . 3  |-  ( ( f  =  F  /\  p  =  P )  ->  ( ( p ` 
0 )  =  ( p `  ( # `  f ) )  <->  ( P `  0 )  =  ( P `  ( # `
 F ) ) ) )
91, 8isprmpt2 6977 . 2  |-  ( ( V  e.  X  /\  E  e.  Y )  ->  ( ( F  e.  W  /\  P  e.  Z )  ->  ( F ( V Cycles  E
) P  <->  ( F
( V Paths  E ) P  /\  ( P ` 
0 )  =  ( P `  ( # `  F ) ) ) ) ) )
109imp 431 1  |-  ( ( ( V  e.  X  /\  E  e.  Y
)  /\  ( F  e.  W  /\  P  e.  Z ) )  -> 
( F ( V Cycles  E ) P  <->  ( F
( V Paths  E ) P  /\  ( P ` 
0 )  =  ( P `  ( # `  F ) ) ) ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 188    /\ wa 371    = wceq 1438    e. wcel 1869   class class class wbr 4421   ` cfv 5599  (class class class)co 6303   0cc0 9541   #chash 12516   Paths cpath 25220   Cycles ccycl 25227
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1666  ax-4 1679  ax-5 1749  ax-6 1795  ax-7 1840  ax-8 1871  ax-9 1873  ax-10 1888  ax-11 1893  ax-12 1906  ax-13 2054  ax-ext 2401  ax-rep 4534  ax-sep 4544  ax-nul 4553  ax-pow 4600  ax-pr 4658  ax-un 6595  ax-cnex 9597  ax-resscn 9598  ax-1cn 9599  ax-icn 9600  ax-addcl 9601  ax-addrcl 9602  ax-mulcl 9603  ax-mulrcl 9604  ax-mulcom 9605  ax-addass 9606  ax-mulass 9607  ax-distr 9608  ax-i2m1 9609  ax-1ne0 9610  ax-1rid 9611  ax-rnegex 9612  ax-rrecex 9613  ax-cnre 9614  ax-pre-lttri 9615  ax-pre-lttrn 9616  ax-pre-ltadd 9617  ax-pre-mulgt0 9618
This theorem depends on definitions:  df-bi 189  df-or 372  df-an 373  df-3or 984  df-3an 985  df-tru 1441  df-ex 1661  df-nf 1665  df-sb 1788  df-eu 2270  df-mo 2271  df-clab 2409  df-cleq 2415  df-clel 2418  df-nfc 2573  df-ne 2621  df-nel 2622  df-ral 2781  df-rex 2782  df-reu 2783  df-rmo 2784  df-rab 2785  df-v 3084  df-sbc 3301  df-csb 3397  df-dif 3440  df-un 3442  df-in 3444  df-ss 3451  df-pss 3453  df-nul 3763  df-if 3911  df-pw 3982  df-sn 3998  df-pr 4000  df-tp 4002  df-op 4004  df-uni 4218  df-int 4254  df-iun 4299  df-br 4422  df-opab 4481  df-mpt 4482  df-tr 4517  df-eprel 4762  df-id 4766  df-po 4772  df-so 4773  df-fr 4810  df-we 4812  df-xp 4857  df-rel 4858  df-cnv 4859  df-co 4860  df-dm 4861  df-rn 4862  df-res 4863  df-ima 4864  df-pred 5397  df-ord 5443  df-on 5444  df-lim 5445  df-suc 5446  df-iota 5563  df-fun 5601  df-fn 5602  df-f 5603  df-f1 5604  df-fo 5605  df-f1o 5606  df-fv 5607  df-riota 6265  df-ov 6306  df-oprab 6307  df-mpt2 6308  df-om 6705  df-1st 6805  df-2nd 6806  df-wrecs 7034  df-recs 7096  df-rdg 7134  df-1o 7188  df-oadd 7192  df-er 7369  df-map 7480  df-pm 7481  df-en 7576  df-dom 7577  df-sdom 7578  df-fin 7579  df-card 8376  df-cda 8600  df-pnf 9679  df-mnf 9680  df-xr 9681  df-ltxr 9682  df-le 9683  df-sub 9864  df-neg 9865  df-nn 10612  df-2 10670  df-n0 10872  df-z 10940  df-uz 11162  df-fz 11787  df-fzo 11918  df-hash 12517  df-word 12662  df-wlk 25228  df-trail 25229  df-pth 25230  df-cycl 25233
This theorem is referenced by:  0cycl  25347  cyclispth  25349  cycliscrct  25350  cyclnspth  25351  cyclispthon  25353  usgrcyclnl1  25360  usgrcyclnl2  25361  3v3e3cycl1  25364  constr3cycl  25381  4cycl4v4e  25386  4cycl4dv4e  25388
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