Theorem clwwlknonex2e 16290

Description: Extending a closed walk W on vertex X by an additional edge (forth and back) results in a closed walk on vertex X. (Contributed by AV, 17-Apr-2022.)

Hypotheses

Ref	Expression
clwwlknonex2.v	|- V = (Vtx ` G )
clwwlknonex2.e	|- E = (Edg ` G )

Assertion

Ref	Expression
clwwlknonex2e	|- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ { X , Y } e. E /\ W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) ) -> ( ( W ++ <" X "> ) ++ <" Y "> ) e. ( X (ClWWalksNOn ` G ) N ) )

Proof of Theorem clwwlknonex2e

Step	Hyp	Ref	Expression
1		clwwlknonex2.v	. . 3 |- V = (Vtx ` G )
2		clwwlknonex2.e	. . 3 |- E = (Edg ` G )
3	1, 2	clwwlknonex2 16289	. 2 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ { X , Y } e. E /\ W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) ) -> ( ( W ++ <" X "> ) ++ <" Y "> ) e. ( N ClWWalksN G ) )
4		isclwwlknon 16280	. . . . 5 |- ( W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) <-> ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) )
5		isclwwlkn 16263	. . . . . . . . . 10 |- ( W e. ( ( N - 2 ) ClWWalksN G ) <-> ( W e. (ClWWalks ` G ) /\ (♯ ` W ) = ( N - 2 ) ) )
6	1	clwwlkbp 16245	. . . . . . . . . . . . 13 |- ( W e. (ClWWalks ` G ) -> ( G e. _V /\ W e. Word V /\ W =/= (/) ) )
7	6	simp2d 1036	. . . . . . . . . . . 12 |- ( W e. (ClWWalks ` G ) -> W e. Word V )
8		clwwlkgt0 16246	. . . . . . . . . . . 12 |- ( W e. (ClWWalks ` G ) -> 0 < (♯ ` W ) )
9	7, 8	jca 306	. . . . . . . . . . 11 |- ( W e. (ClWWalks ` G ) -> ( W e. Word V /\ 0 < (♯ ` W ) ) )
10	9	adantr 276	. . . . . . . . . 10 |- ( ( W e. (ClWWalks ` G ) /\ (♯ ` W ) = ( N - 2 ) ) -> ( W e. Word V /\ 0 < (♯ ` W ) ) )
11	5, 10	sylbi 121	. . . . . . . . 9 |- ( W e. ( ( N - 2 ) ClWWalksN G ) -> ( W e. Word V /\ 0 < (♯ ` W ) ) )
12	11	ad2antrl 490	. . . . . . . 8 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) ) -> ( W e. Word V /\ 0 < (♯ ` W ) ) )
13		simpl1 1026	. . . . . . . 8 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) ) -> X e. V )
14		simpl2 1027	. . . . . . . 8 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) ) -> Y e. V )
15		ccat2s1fstg 11224	. . . . . . . 8 |- ( ( ( W e. Word V /\ 0 < (♯ ` W ) ) /\ ( X e. V /\ Y e. V ) ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = ( W ` 0 ) )
16	12, 13, 14, 15	syl12anc 1271	. . . . . . 7 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = ( W ` 0 ) )
17		simprr 533	. . . . . . 7 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) ) -> ( W ` 0 ) = X )
18	16, 17	eqtrd 2264	. . . . . 6 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = X )
19	18	ex 115	. . . . 5 |- ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) -> ( ( W e. ( ( N - 2 ) ClWWalksN G ) /\ ( W ` 0 ) = X ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = X ) )
20	4, 19	biimtrid 152	. . . 4 |- ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) -> ( W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = X ) )
21	20	a1d 22	. . 3 |- ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) -> ( { X , Y } e. E -> ( W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = X ) ) )
22	21	3imp 1219	. 2 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ { X , Y } e. E /\ W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) ) -> ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = X )
23		isclwwlknon 16280	. 2 |- ( ( ( W ++ <" X "> ) ++ <" Y "> ) e. ( X (ClWWalksNOn ` G ) N ) <-> ( ( ( W ++ <" X "> ) ++ <" Y "> ) e. ( N ClWWalksN G ) /\ ( ( ( W ++ <" X "> ) ++ <" Y "> ) ` 0 ) = X ) )
24	3, 22, 23	sylanbrc 417	1 |- ( ( ( X e. V /\ Y e. V /\ N e. ( ZZ>= ` 3 ) ) /\ { X , Y } e. E /\ W e. ( X (ClWWalksNOn ` G ) ( N - 2 ) ) ) -> ( ( W ++ <" X "> ) ++ <" Y "> ) e. ( X (ClWWalksNOn ` G ) N ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1004   = wceq 1397   e. wcel 2202   =/= wne 2402   _Vcvv 2802   (/)c0 3494   {cpr 3670   class class class wbr 4088   ` cfv 5326  (class class class)co 6017   0cc0 8031   < clt 8213   - cmin 8349   2c2 9193   3c3 9194   ZZ>=cuz 9754  ♯chash 11036  Word cword 11112   ++ cconcat 11166   <"cs1 11191  Vtxcvtx 15862  Edgcedg 15907  ClWWalkscclwwlk 16241   ClWWalksN cclwwlkn 16253  ClWWalksNOncclwwlknon 16276

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-iinf 4686  ax-cnex 8122  ax-resscn 8123  ax-1cn 8124  ax-1re 8125  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-mulrcl 8130  ax-addcom 8131  ax-mulcom 8132  ax-addass 8133  ax-mulass 8134  ax-distr 8135  ax-i2m1 8136  ax-0lt1 8137  ax-1rid 8138  ax-0id 8139  ax-rnegex 8140  ax-precex 8141  ax-cnre 8142  ax-pre-ltirr 8143  ax-pre-ltwlin 8144  ax-pre-lttrn 8145  ax-pre-apti 8146  ax-pre-ltadd 8147  ax-pre-mulgt0 8148

This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-if 3606  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-tr 4188  df-id 4390  df-iord 4463  df-on 4465  df-ilim 4466  df-suc 4468  df-iom 4689  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-recs 6470  df-frec 6556  df-1o 6581  df-er 6701  df-map 6818  df-en 6909  df-dom 6910  df-fin 6911  df-pnf 8215  df-mnf 8216  df-xr 8217  df-ltxr 8218  df-le 8219  df-sub 8351  df-neg 8352  df-reap 8754  df-ap 8761  df-inn 9143  df-2 9201  df-3 9202  df-n0 9402  df-z 9479  df-uz 9755  df-fz 10243  df-fzo 10377  df-ihash 11037  df-word 11113  df-lsw 11158  df-concat 11167  df-s1 11192  df-ndx 13084  df-slot 13085  df-base 13087  df-vtx 15864  df-clwwlk 16242  df-clwwlkn 16254  df-clwwlknon 16277

This theorem is referenced by: (None)