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Theorem wwlksnwwlksnon 29433

Description: A walk of fixed length is a walk of fixed length between two vertices. (Contributed by Alexander van der Vekens, 21-Feb-2018.) (Revised by AV, 12-May-2021.) (Revised by AV, 13-Mar-2022.)

**Hypothesis**
Ref	Expression
wwlksnwwlksnon.v	⊢ 𝑉 = (Vtx‘𝐺)

**Assertion**
Ref	Expression
wwlksnwwlksnon	⊢ (𝑊 ∈ (𝑁 WWalksN 𝐺) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑊 ∈ (𝑎(𝑁 WWalksNOn 𝐺)𝑏))

Distinct variable groups: 𝐺,𝑎,𝑏 𝑁,𝑎,𝑏 𝑉,𝑎,𝑏 𝑊,𝑎,𝑏

**Proof of Theorem wwlksnwwlksnon**
Step	Hyp	Ref	Expression
1		wwlknbp1 29362	. . . 4 ⊢ (𝑊 ∈ (𝑁 WWalksN 𝐺) → (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)))
2		wwlksnwwlksnon.v	. . . . . . . . . . 11 ⊢ 𝑉 = (Vtx‘𝐺)
3	2	eqcomi 2740	. . . . . . . . . 10 ⊢ (Vtx‘𝐺) = 𝑉
4	3	wrdeqi 14492	. . . . . . . . 9 ⊢ Word (Vtx‘𝐺) = Word 𝑉
5	4	eleq2i 2824	. . . . . . . 8 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) ↔ 𝑊 ∈ Word 𝑉)
6	5	biimpi 215	. . . . . . 7 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) → 𝑊 ∈ Word 𝑉)
7	6	3ad2ant2 1133	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → 𝑊 ∈ Word 𝑉)
8		nn0p1nn 12516	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ ℕ)
9		lbfzo0 13677	. . . . . . . . . 10 ⊢ (0 ∈ (0..^(𝑁 + 1)) ↔ (𝑁 + 1) ∈ ℕ)
10	8, 9	sylibr 233	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ₀ → 0 ∈ (0..^(𝑁 + 1)))
11	10	3ad2ant1 1132	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → 0 ∈ (0..^(𝑁 + 1)))
12		oveq2 7420	. . . . . . . . . 10 ⊢ ((♯‘𝑊) = (𝑁 + 1) → (0..^(♯‘𝑊)) = (0..^(𝑁 + 1)))
13	12	eleq2d 2818	. . . . . . . . 9 ⊢ ((♯‘𝑊) = (𝑁 + 1) → (0 ∈ (0..^(♯‘𝑊)) ↔ 0 ∈ (0..^(𝑁 + 1))))
14	13	3ad2ant3 1134	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → (0 ∈ (0..^(♯‘𝑊)) ↔ 0 ∈ (0..^(𝑁 + 1))))
15	11, 14	mpbird 256	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → 0 ∈ (0..^(♯‘𝑊)))
16	15	adantl 481	. . . . . 6 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → 0 ∈ (0..^(♯‘𝑊)))
17		wrdsymbcl 14482	. . . . . 6 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 0 ∈ (0..^(♯‘𝑊))) → (𝑊‘0) ∈ 𝑉)
18	7, 16, 17	syl2an2 683	. . . . 5 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → (𝑊‘0) ∈ 𝑉)
19		fzonn0p1 13714	. . . . . . . . 9 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ (0..^(𝑁 + 1)))
20	19	3ad2ant1 1132	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → 𝑁 ∈ (0..^(𝑁 + 1)))
21	12	eleq2d 2818	. . . . . . . . 9 ⊢ ((♯‘𝑊) = (𝑁 + 1) → (𝑁 ∈ (0..^(♯‘𝑊)) ↔ 𝑁 ∈ (0..^(𝑁 + 1))))
22	21	3ad2ant3 1134	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → (𝑁 ∈ (0..^(♯‘𝑊)) ↔ 𝑁 ∈ (0..^(𝑁 + 1))))
23	20, 22	mpbird 256	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → 𝑁 ∈ (0..^(♯‘𝑊)))
24		wrdsymbcl 14482	. . . . . . 7 ⊢ ((𝑊 ∈ Word 𝑉 ∧ 𝑁 ∈ (0..^(♯‘𝑊))) → (𝑊‘𝑁) ∈ 𝑉)
25	7, 23, 24	syl2anc 583	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1)) → (𝑊‘𝑁) ∈ 𝑉)
26	25	adantl 481	. . . . 5 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → (𝑊‘𝑁) ∈ 𝑉)
27		simpl 482	. . . . 5 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → 𝑊 ∈ (𝑁 WWalksN 𝐺))
28		eqidd 2732	. . . . 5 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → (𝑊‘0) = (𝑊‘0))
29		eqidd 2732	. . . . 5 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → (𝑊‘𝑁) = (𝑊‘𝑁))
30		eqeq2 2743	. . . . . . 7 ⊢ (𝑎 = (𝑊‘0) → ((𝑊‘0) = 𝑎 ↔ (𝑊‘0) = (𝑊‘0)))
31	30	3anbi2d 1440	. . . . . 6 ⊢ (𝑎 = (𝑊‘0) → ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏) ↔ (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = (𝑊‘0) ∧ (𝑊‘𝑁) = 𝑏)))
32		eqeq2 2743	. . . . . . 7 ⊢ (𝑏 = (𝑊‘𝑁) → ((𝑊‘𝑁) = 𝑏 ↔ (𝑊‘𝑁) = (𝑊‘𝑁)))
33	32	3anbi3d 1441	. . . . . 6 ⊢ (𝑏 = (𝑊‘𝑁) → ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = (𝑊‘0) ∧ (𝑊‘𝑁) = 𝑏) ↔ (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = (𝑊‘0) ∧ (𝑊‘𝑁) = (𝑊‘𝑁))))
34	31, 33	rspc2ev 3625	. . . . 5 ⊢ (((𝑊‘0) ∈ 𝑉 ∧ (𝑊‘𝑁) ∈ 𝑉 ∧ (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = (𝑊‘0) ∧ (𝑊‘𝑁) = (𝑊‘𝑁))) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏))
35	18, 26, 27, 28, 29, 34	syl113anc 1381	. . . 4 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑁 ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = (𝑁 + 1))) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏))
36	1, 35	mpdan 684	. . 3 ⊢ (𝑊 ∈ (𝑁 WWalksN 𝐺) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏))
37		simp1 1135	. . . . 5 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏) → 𝑊 ∈ (𝑁 WWalksN 𝐺))
38	37	a1i 11	. . . 4 ⊢ ((𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) → ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏) → 𝑊 ∈ (𝑁 WWalksN 𝐺)))
39	38	rexlimivv 3198	. . 3 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏) → 𝑊 ∈ (𝑁 WWalksN 𝐺))
40	36, 39	impbii 208	. 2 ⊢ (𝑊 ∈ (𝑁 WWalksN 𝐺) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏))
41		wwlknon 29375	. . . 4 ⊢ (𝑊 ∈ (𝑎(𝑁 WWalksNOn 𝐺)𝑏) ↔ (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏))
42	41	bicomi 223	. . 3 ⊢ ((𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏) ↔ 𝑊 ∈ (𝑎(𝑁 WWalksNOn 𝐺)𝑏))
43	42	2rexbii 3128	. 2 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (𝑊 ∈ (𝑁 WWalksN 𝐺) ∧ (𝑊‘0) = 𝑎 ∧ (𝑊‘𝑁) = 𝑏) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑊 ∈ (𝑎(𝑁 WWalksNOn 𝐺)𝑏))
44	40, 43	bitri 274	1 ⊢ (𝑊 ∈ (𝑁 WWalksN 𝐺) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 𝑊 ∈ (𝑎(𝑁 WWalksNOn 𝐺)𝑏))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 ∃wrex 3069 ‘cfv 6544 (class class class)co 7412 0cc0 11113 1c1 11114 + caddc 11116 ℕcn 12217 ℕ₀cn0 12477 ..^cfzo 13632 ♯chash 14295 Word cword 14469 Vtxcvtx 28520 WWalksN cwwlksn 29344 WWalksNOn cwwlksnon 29345

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7728 ax-cnex 11169 ax-resscn 11170 ax-1cn 11171 ax-icn 11172 ax-addcl 11173 ax-addrcl 11174 ax-mulcl 11175 ax-mulrcl 11176 ax-mulcom 11177 ax-addass 11178 ax-mulass 11179 ax-distr 11180 ax-i2m1 11181 ax-1ne0 11182 ax-1rid 11183 ax-rnegex 11184 ax-rrecex 11185 ax-cnre 11186 ax-pre-lttri 11187 ax-pre-lttrn 11188 ax-pre-ltadd 11189 ax-pre-mulgt0 11190

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7859 df-1st 7978 df-2nd 7979 df-frecs 8269 df-wrecs 8300 df-recs 8374 df-rdg 8413 df-1o 8469 df-er 8706 df-map 8825 df-en 8943 df-dom 8944 df-sdom 8945 df-fin 8946 df-card 9937 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-nn 12218 df-n0 12478 df-z 12564 df-uz 12828 df-fz 13490 df-fzo 13633 df-hash 14296 df-word 14470 df-wwlks 29348 df-wwlksn 29349 df-wwlksnon 29350

This theorem is referenced by: wspthsnwspthsnon 29434 elwwlks2 29484

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