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Theorem wwlksnextproplem1 29431

Description: Lemma 1 for wwlksnextprop 29434. (Contributed by Alexander van der Vekens, 31-Jul-2018.) (Revised by AV, 20-Apr-2021.) (Revised by AV, 29-Oct-2022.)

**Hypothesis**
Ref	Expression
wwlksnextprop.x	⊢ 𝑋 = ((𝑁 + 1) WWalksN 𝐺)

**Assertion**
Ref	Expression
wwlksnextproplem1	⊢ ((𝑊 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → ((𝑊 prefix (𝑁 + 1))‘0) = (𝑊‘0))

**Proof of Theorem wwlksnextproplem1**
Step	Hyp	Ref	Expression
1		wwlknbp1 29366	. . . . 5 ⊢ (𝑊 ∈ ((𝑁 + 1) WWalksN 𝐺) → ((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)))
2		simpl2 1191	. . . . . . 7 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → 𝑊 ∈ Word (Vtx‘𝐺))
3		peano2nn0 12517	. . . . . . . . . . 11 ⊢ ((𝑁 + 1) ∈ ℕ₀ → ((𝑁 + 1) + 1) ∈ ℕ₀)
4	3	3ad2ant1 1132	. . . . . . . . . 10 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → ((𝑁 + 1) + 1) ∈ ℕ₀)
5		eleq1 2820	. . . . . . . . . . 11 ⊢ ((♯‘𝑊) = ((𝑁 + 1) + 1) → ((♯‘𝑊) ∈ ℕ₀ ↔ ((𝑁 + 1) + 1) ∈ ℕ₀))
6	5	3ad2ant3 1134	. . . . . . . . . 10 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → ((♯‘𝑊) ∈ ℕ₀ ↔ ((𝑁 + 1) + 1) ∈ ℕ₀))
7	4, 6	mpbird 257	. . . . . . . . 9 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → (♯‘𝑊) ∈ ℕ₀)
8	7	adantr 480	. . . . . . . 8 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → (♯‘𝑊) ∈ ℕ₀)
9		simpr 484	. . . . . . . . 9 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → 𝑁 ∈ ℕ₀)
10		nn0re 12486	. . . . . . . . . . . . 13 ⊢ ((𝑁 + 1) ∈ ℕ₀ → (𝑁 + 1) ∈ ℝ)
11	10	lep1d 12150	. . . . . . . . . . . 12 ⊢ ((𝑁 + 1) ∈ ℕ₀ → (𝑁 + 1) ≤ ((𝑁 + 1) + 1))
12	11	3ad2ant1 1132	. . . . . . . . . . 11 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 + 1) ≤ ((𝑁 + 1) + 1))
13		breq2 5152	. . . . . . . . . . . 12 ⊢ ((♯‘𝑊) = ((𝑁 + 1) + 1) → ((𝑁 + 1) ≤ (♯‘𝑊) ↔ (𝑁 + 1) ≤ ((𝑁 + 1) + 1)))
14	13	3ad2ant3 1134	. . . . . . . . . . 11 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → ((𝑁 + 1) ≤ (♯‘𝑊) ↔ (𝑁 + 1) ≤ ((𝑁 + 1) + 1)))
15	12, 14	mpbird 257	. . . . . . . . . 10 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 + 1) ≤ (♯‘𝑊))
16	15	adantr 480	. . . . . . . . 9 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ≤ (♯‘𝑊))
17		nn0p1elfzo 13680	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℕ₀ ∧ (♯‘𝑊) ∈ ℕ₀ ∧ (𝑁 + 1) ≤ (♯‘𝑊)) → 𝑁 ∈ (0..^(♯‘𝑊)))
18	9, 8, 16, 17	syl3anc 1370	. . . . . . . 8 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → 𝑁 ∈ (0..^(♯‘𝑊)))
19		fz0add1fz1 13707	. . . . . . . 8 ⊢ (((♯‘𝑊) ∈ ℕ₀ ∧ 𝑁 ∈ (0..^(♯‘𝑊))) → (𝑁 + 1) ∈ (1...(♯‘𝑊)))
20	8, 18, 19	syl2anc 583	. . . . . . 7 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ∈ (1...(♯‘𝑊)))
21	2, 20	jca 511	. . . . . 6 ⊢ ((((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) ∧ 𝑁 ∈ ℕ₀) → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (1...(♯‘𝑊))))
22	21	ex 412	. . . . 5 ⊢ (((𝑁 + 1) ∈ ℕ₀ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 ∈ ℕ₀ → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (1...(♯‘𝑊)))))
23	1, 22	syl 17	. . . 4 ⊢ (𝑊 ∈ ((𝑁 + 1) WWalksN 𝐺) → (𝑁 ∈ ℕ₀ → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (1...(♯‘𝑊)))))
24		wwlksnextprop.x	. . . 4 ⊢ 𝑋 = ((𝑁 + 1) WWalksN 𝐺)
25	23, 24	eleq2s 2850	. . 3 ⊢ (𝑊 ∈ 𝑋 → (𝑁 ∈ ℕ₀ → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (1...(♯‘𝑊)))))
26	25	imp 406	. 2 ⊢ ((𝑊 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (1...(♯‘𝑊))))
27		pfxfv0 14647	. 2 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (1...(♯‘𝑊))) → ((𝑊 prefix (𝑁 + 1))‘0) = (𝑊‘0))
28	26, 27	syl 17	1 ⊢ ((𝑊 ∈ 𝑋 ∧ 𝑁 ∈ ℕ₀) → ((𝑊 prefix (𝑁 + 1))‘0) = (𝑊‘0))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 class class class wbr 5148 ‘cfv 6543 (class class class)co 7412 0cc0 11114 1c1 11115 + caddc 11117 ≤ cle 11254 ℕ₀cn0 12477 ...cfz 13489 ..^cfzo 13632 ♯chash 14295 Word cword 14469 prefix cpfx 14625 Vtxcvtx 28524 WWalksN cwwlksn 29348

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 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191

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 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-er 8707 df-map 8826 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-card 9938 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-substr 14596 df-pfx 14626 df-wwlks 29352 df-wwlksn 29353

This theorem is referenced by: wwlksnextproplem3 29433 wwlksnextprop 29434

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