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Theorem wwlksnred 26787

Description: Reduction of a walk (as word) by removing the trailing edge/vertex. (Contributed by Alexander van der Vekens, 4-Aug-2018.) (Revised by AV, 16-Apr-2021.)

**Assertion**
Ref	Expression
wwlksnred	⊢ (𝑁 ∈ ℕ₀ → (𝑊 ∈ ((𝑁 + 1) WWalksN 𝐺) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺)))

Proof of Theorem wwlksnred Dummy variable 𝑖 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		peano2nn0 11333	. . 3 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ ℕ₀)
2		iswwlksn 26730	. . 3 ⊢ ((𝑁 + 1) ∈ ℕ₀ → (𝑊 ∈ ((𝑁 + 1) WWalksN 𝐺) ↔ (𝑊 ∈ (WWalks‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))))
3	1, 2	syl 17	. 2 ⊢ (𝑁 ∈ ℕ₀ → (𝑊 ∈ ((𝑁 + 1) WWalksN 𝐺) ↔ (𝑊 ∈ (WWalks‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))))
4		eqid 2622	. . . . 5 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺)
5		eqid 2622	. . . . 5 ⊢ (Edg‘𝐺) = (Edg‘𝐺)
6	4, 5	iswwlks 26728	. . . 4 ⊢ (𝑊 ∈ (WWalks‘𝐺) ↔ (𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
7		simp1 1061	. . . . . . . . . . . 12 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → 𝑊 ∈ Word (Vtx‘𝐺))
8		nn0p1nn 11332	. . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ ℕ)
9	8	3ad2ant3 1084	. . . . . . . . . . . 12 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ∈ ℕ)
10	1	nn0red 11352	. . . . . . . . . . . . . . 15 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ ℝ)
11	10	lep1d 10955	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ≤ ((𝑁 + 1) + 1))
12	11	3ad2ant3 1084	. . . . . . . . . . . . 13 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ≤ ((𝑁 + 1) + 1))
13		breq2 4657	. . . . . . . . . . . . . 14 ⊢ ((#‘𝑊) = ((𝑁 + 1) + 1) → ((𝑁 + 1) ≤ (#‘𝑊) ↔ (𝑁 + 1) ≤ ((𝑁 + 1) + 1)))
14	13	3ad2ant2 1083	. . . . . . . . . . . . 13 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → ((𝑁 + 1) ≤ (#‘𝑊) ↔ (𝑁 + 1) ≤ ((𝑁 + 1) + 1)))
15	12, 14	mpbird 247	. . . . . . . . . . . 12 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ≤ (#‘𝑊))
16		swrdn0 13430	. . . . . . . . . . . 12 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ ℕ ∧ (𝑁 + 1) ≤ (#‘𝑊)) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅)
17	7, 9, 15, 16	syl3anc 1326	. . . . . . . . . . 11 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅)
18	17	3exp 1264	. . . . . . . . . 10 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) → ((#‘𝑊) = ((𝑁 + 1) + 1) → (𝑁 ∈ ℕ₀ → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅)))
19	18	3ad2ant2 1083	. . . . . . . . 9 ⊢ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → ((#‘𝑊) = ((𝑁 + 1) + 1) → (𝑁 ∈ ℕ₀ → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅)))
20	19	imp 445	. . . . . . . 8 ⊢ (((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 ∈ ℕ₀ → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅))
21	20	impcom 446	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅)
22		swrdcl 13419	. . . . . . . . . 10 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ Word (Vtx‘𝐺))
23	22	3ad2ant2 1083	. . . . . . . . 9 ⊢ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ Word (Vtx‘𝐺))
24	23	adantr 481	. . . . . . . 8 ⊢ (((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ Word (Vtx‘𝐺))
25	24	adantl 482	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ Word (Vtx‘𝐺))
26		oveq1 6657	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((#‘𝑊) = ((𝑁 + 1) + 1) → ((#‘𝑊) − 1) = (((𝑁 + 1) + 1) − 1))
27	1	nn0cnd 11353	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ ℂ)
28		1cnd 10056	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑁 ∈ ℕ₀ → 1 ∈ ℂ)
29	27, 28	pncand 10393	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑁 ∈ ℕ₀ → (((𝑁 + 1) + 1) − 1) = (𝑁 + 1))
30	26, 29	sylan9eq 2676	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → ((#‘𝑊) − 1) = (𝑁 + 1))
31	30	oveq2d 6666	. . . . . . . . . . . . . . . . . . 19 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (0..^((#‘𝑊) − 1)) = (0..^(𝑁 + 1)))
32	31	raleqdv 3144	. . . . . . . . . . . . . . . . . 18 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ (0..^(𝑁 + 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
33	32	adantl 482	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ (0..^(𝑁 + 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
34		nn0z 11400	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℤ)
35		nn0z 11400	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑁 + 1) ∈ ℕ₀ → (𝑁 + 1) ∈ ℤ)
36	1, 35	syl 17	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ ℤ)
37		nn0re 11301	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℝ)
38	37	lep1d 10955	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ≤ (𝑁 + 1))
39	34, 36, 38	3jca 1242	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 ∈ ℤ ∧ (𝑁 + 1) ∈ ℤ ∧ 𝑁 ≤ (𝑁 + 1)))
40	39	ad2antll 765	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑁 ∈ ℤ ∧ (𝑁 + 1) ∈ ℤ ∧ 𝑁 ≤ (𝑁 + 1)))
41		eluz2 11693	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑁 + 1) ∈ (ℤ_≥‘𝑁) ↔ (𝑁 ∈ ℤ ∧ (𝑁 + 1) ∈ ℤ ∧ 𝑁 ≤ (𝑁 + 1)))
42	40, 41	sylibr 224	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑁 + 1) ∈ (ℤ_≥‘𝑁))
43		fzoss2 12496	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑁 + 1) ∈ (ℤ_≥‘𝑁) → (0..^𝑁) ⊆ (0..^(𝑁 + 1)))
44	42, 43	syl 17	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (0..^𝑁) ⊆ (0..^(𝑁 + 1)))
45		ssralv 3666	. . . . . . . . . . . . . . . . . . 19 ⊢ ((0..^𝑁) ⊆ (0..^(𝑁 + 1)) → (∀𝑖 ∈ (0..^(𝑁 + 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → ∀𝑖 ∈ (0..^𝑁){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
46	44, 45	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (∀𝑖 ∈ (0..^(𝑁 + 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → ∀𝑖 ∈ (0..^𝑁){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
47		simpl 473	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → 𝑊 ∈ Word (Vtx‘𝐺))
48	47	adantr 481	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → 𝑊 ∈ Word (Vtx‘𝐺))
49		nn0fz0 12437	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ((𝑁 + 1) ∈ ℕ₀ ↔ (𝑁 + 1) ∈ (0...(𝑁 + 1)))
50	1, 49	sylib 208	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ (0...(𝑁 + 1)))
51	50	ad2antll 765	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑁 + 1) ∈ (0...(𝑁 + 1)))
52		fzelp1 12393	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ ((𝑁 + 1) ∈ (0...(𝑁 + 1)) → (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1)))
53	51, 52	syl 17	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1)))
54		oveq2 6658	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ((#‘𝑊) = ((𝑁 + 1) + 1) → (0...(#‘𝑊)) = (0...((𝑁 + 1) + 1)))
55	54	eleq2d 2687	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ ((#‘𝑊) = ((𝑁 + 1) + 1) → ((𝑁 + 1) ∈ (0...(#‘𝑊)) ↔ (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1))))
56	55	adantr 481	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → ((𝑁 + 1) ∈ (0...(#‘𝑊)) ↔ (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1))))
57	56	adantl 482	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → ((𝑁 + 1) ∈ (0...(#‘𝑊)) ↔ (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1))))
58	53, 57	mpbird 247	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑁 + 1) ∈ (0...(#‘𝑊)))
59	58	adantr 481	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → (𝑁 + 1) ∈ (0...(#‘𝑊)))
60		fzossfzop1 12545	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑁 ∈ ℕ₀ → (0..^𝑁) ⊆ (0..^(𝑁 + 1)))
61	60	sseld 3602	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝑁 ∈ ℕ₀ → (𝑖 ∈ (0..^𝑁) → 𝑖 ∈ (0..^(𝑁 + 1))))
62	61	ad2antll 765	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑖 ∈ (0..^𝑁) → 𝑖 ∈ (0..^(𝑁 + 1))))
63	62	imp 445	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → 𝑖 ∈ (0..^(𝑁 + 1)))
64		swrd0fv 13439	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊)) ∧ 𝑖 ∈ (0..^(𝑁 + 1))) → ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖) = (𝑊‘𝑖))
65	48, 59, 63, 64	syl3anc 1326	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖) = (𝑊‘𝑖))
66	65	eqcomd 2628	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → (𝑊‘𝑖) = ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖))
67		fzofzp1 12565	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝑖 ∈ (0..^𝑁) → (𝑖 + 1) ∈ (0...𝑁))
68	67	adantl 482	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → (𝑖 + 1) ∈ (0...𝑁))
69		fzval3 12536	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑁 ∈ ℤ → (0...𝑁) = (0..^(𝑁 + 1)))
70	69	eqcomd 2628	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑁 ∈ ℤ → (0..^(𝑁 + 1)) = (0...𝑁))
71	34, 70	syl 17	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑁 ∈ ℕ₀ → (0..^(𝑁 + 1)) = (0...𝑁))
72	71	eleq2d 2687	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑁 ∈ ℕ₀ → ((𝑖 + 1) ∈ (0..^(𝑁 + 1)) ↔ (𝑖 + 1) ∈ (0...𝑁)))
73	72	ad2antll 765	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → ((𝑖 + 1) ∈ (0..^(𝑁 + 1)) ↔ (𝑖 + 1) ∈ (0...𝑁)))
74	73	adantr 481	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → ((𝑖 + 1) ∈ (0..^(𝑁 + 1)) ↔ (𝑖 + 1) ∈ (0...𝑁)))
75	68, 74	mpbird 247	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → (𝑖 + 1) ∈ (0..^(𝑁 + 1)))
76		swrd0fv 13439	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊)) ∧ (𝑖 + 1) ∈ (0..^(𝑁 + 1))) → ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1)) = (𝑊‘(𝑖 + 1)))
77	48, 59, 75, 76	syl3anc 1326	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1)) = (𝑊‘(𝑖 + 1)))
78	77	eqcomd 2628	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → (𝑊‘(𝑖 + 1)) = ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1)))
79	66, 78	preq12d 4276	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → {(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} = {((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))})
80	79	eleq1d 2686	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → ({(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
81	80	biimpd 219	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ 𝑖 ∈ (0..^𝑁)) → ({(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → {((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
82	81	ralimdva 2962	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (∀𝑖 ∈ (0..^𝑁){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → ∀𝑖 ∈ (0..^𝑁){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
83	46, 82	syld 47	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (∀𝑖 ∈ (0..^(𝑁 + 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → ∀𝑖 ∈ (0..^𝑁){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
84	33, 83	sylbid 230	. . . . . . . . . . . . . . . 16 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → ∀𝑖 ∈ (0..^𝑁){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
85	84	imp 445	. . . . . . . . . . . . . . 15 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → ∀𝑖 ∈ (0..^𝑁){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺))
86		nn0cn 11302	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑁 ∈ ℕ₀ → 𝑁 ∈ ℂ)
87	86, 28	pncand 10393	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑁 ∈ ℕ₀ → ((𝑁 + 1) − 1) = 𝑁)
88	87	oveq2d 6666	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑁 ∈ ℕ₀ → (0..^((𝑁 + 1) − 1)) = (0..^𝑁))
89	88	ad2antll 765	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (0..^((𝑁 + 1) − 1)) = (0..^𝑁))
90	89	adantr 481	. . . . . . . . . . . . . . . 16 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → (0..^((𝑁 + 1) − 1)) = (0..^𝑁))
91	90	raleqdv 3144	. . . . . . . . . . . . . . 15 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → (∀𝑖 ∈ (0..^((𝑁 + 1) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ (0..^𝑁){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
92	85, 91	mpbird 247	. . . . . . . . . . . . . 14 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → ∀𝑖 ∈ (0..^((𝑁 + 1) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺))
93	1	ad2antll 765	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑁 + 1) ∈ ℕ₀)
94		simpl 473	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (#‘𝑊) = ((𝑁 + 1) + 1))
95	94	adantl 482	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (#‘𝑊) = ((𝑁 + 1) + 1))
96		swrd0len0 13436	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ ℕ₀ ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) = (𝑁 + 1))
97	47, 93, 95, 96	syl3anc 1326	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) = (𝑁 + 1))
98	97	oveq1d 6665	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → ((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1) = ((𝑁 + 1) − 1))
99	98	oveq2d 6666	. . . . . . . . . . . . . . . 16 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)) = (0..^((𝑁 + 1) − 1)))
100	99	raleqdv 3144	. . . . . . . . . . . . . . 15 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ (0..^((𝑁 + 1) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
101	100	adantr 481	. . . . . . . . . . . . . 14 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → (∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ (0..^((𝑁 + 1) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
102	92, 101	mpbird 247	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺))
103	102	exp31 630	. . . . . . . . . . . 12 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) → (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺))))
104	103	com23 86	. . . . . . . . . . 11 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) → (∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺) → (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺))))
105	104	imp 445	. . . . . . . . . 10 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
106	105	3adant1 1079	. . . . . . . . 9 ⊢ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
107	106	expdimp 453	. . . . . . . 8 ⊢ (((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 ∈ ℕ₀ → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
108	107	impcom 446	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺))
109	4, 5	iswwlks 26728	. . . . . . 7 ⊢ ((𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (WWalks‘𝐺) ↔ ((𝑊 substr ⟨0, (𝑁 + 1)⟩) ≠ ∅ ∧ (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) − 1)){((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘𝑖), ((𝑊 substr ⟨0, (𝑁 + 1)⟩)‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
110	21, 25, 108, 109	syl3anbrc 1246	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (WWalks‘𝐺))
111		peano2nn0 11333	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 + 1) ∈ ℕ₀ → ((𝑁 + 1) + 1) ∈ ℕ₀)
112	1, 111	syl 17	. . . . . . . . . . . . . . 15 ⊢ (𝑁 ∈ ℕ₀ → ((𝑁 + 1) + 1) ∈ ℕ₀)
113		elfz2nn0 12431	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 + 1) ∈ (0...((𝑁 + 1) + 1)) ↔ ((𝑁 + 1) ∈ ℕ₀ ∧ ((𝑁 + 1) + 1) ∈ ℕ₀ ∧ (𝑁 + 1) ≤ ((𝑁 + 1) + 1)))
114	1, 112, 11, 113	syl3anbrc 1246	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1)))
115	114	adantl 482	. . . . . . . . . . . . 13 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ∈ (0...((𝑁 + 1) + 1)))
116	115, 56	mpbird 247	. . . . . . . . . . . 12 ⊢ (((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀) → (𝑁 + 1) ∈ (0...(#‘𝑊)))
117	116	anim2i 593	. . . . . . . . . . 11 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ ((#‘𝑊) = ((𝑁 + 1) + 1) ∧ 𝑁 ∈ ℕ₀)) → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊))))
118	117	exp32 631	. . . . . . . . . 10 ⊢ (𝑊 ∈ Word (Vtx‘𝐺) → ((#‘𝑊) = ((𝑁 + 1) + 1) → (𝑁 ∈ ℕ₀ → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊))))))
119	118	3ad2ant2 1083	. . . . . . . . 9 ⊢ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) → ((#‘𝑊) = ((𝑁 + 1) + 1) → (𝑁 ∈ ℕ₀ → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊))))))
120	119	imp 445	. . . . . . . 8 ⊢ (((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 ∈ ℕ₀ → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊)))))
121	120	impcom 446	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → (𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊))))
122		swrd0len 13422	. . . . . . 7 ⊢ ((𝑊 ∈ Word (Vtx‘𝐺) ∧ (𝑁 + 1) ∈ (0...(#‘𝑊))) → (#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) = (𝑁 + 1))
123	121, 122	syl 17	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → (#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) = (𝑁 + 1))
124		iswwlksn 26730	. . . . . . 7 ⊢ (𝑁 ∈ ℕ₀ → ((𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺) ↔ ((𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (WWalks‘𝐺) ∧ (#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) = (𝑁 + 1))))
125	124	adantr 481	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → ((𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺) ↔ ((𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (WWalks‘𝐺) ∧ (#‘(𝑊 substr ⟨0, (𝑁 + 1)⟩)) = (𝑁 + 1))))
126	110, 123, 125	mpbir2and 957	. . . . 5 ⊢ ((𝑁 ∈ ℕ₀ ∧ ((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1))) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺))
127	126	expcom 451	. . . 4 ⊢ (((𝑊 ≠ ∅ ∧ 𝑊 ∈ Word (Vtx‘𝐺) ∧ ∀𝑖 ∈ (0..^((#‘𝑊) − 1)){(𝑊‘𝑖), (𝑊‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 ∈ ℕ₀ → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺)))
128	6, 127	sylanb 489	. . 3 ⊢ ((𝑊 ∈ (WWalks‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑁 ∈ ℕ₀ → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺)))
129	128	com12 32	. 2 ⊢ (𝑁 ∈ ℕ₀ → ((𝑊 ∈ (WWalks‘𝐺) ∧ (#‘𝑊) = ((𝑁 + 1) + 1)) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺)))
130	3, 129	sylbid 230	1 ⊢ (𝑁 ∈ ℕ₀ → (𝑊 ∈ ((𝑁 + 1) WWalksN 𝐺) → (𝑊 substr ⟨0, (𝑁 + 1)⟩) ∈ (𝑁 WWalksN 𝐺)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 ∧ w3a 1037 = wceq 1483 ∈ wcel 1990 ≠ wne 2794 ∀wral 2912 ⊆ wss 3574 ∅c0 3915 {cpr 4179 ⟨cop 4183 class class class wbr 4653 ‘cfv 5888 (class class class)co 6650 0cc0 9936 1c1 9937 + caddc 9939 ≤ cle 10075 − cmin 10266 ℕcn 11020 ℕ₀cn0 11292 ℤcz 11377 ℤ_≥cuz 11687 ...cfz 12326 ..^cfzo 12465 #chash 13117 Word cword 13291 substr csubstr 13295 Vtxcvtx 25874 Edgcedg 25939 WWalkscwwlks 26717 WWalksN cwwlksn 26718

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-oadd 7564 df-er 7742 df-map 7859 df-pm 7860 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-card 8765 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-nn 11021 df-n0 11293 df-z 11378 df-uz 11688 df-fz 12327 df-fzo 12466 df-hash 13118 df-word 13299 df-substr 13303 df-wwlks 26722 df-wwlksn 26723

This theorem is referenced by: wwlksnextbi 26789 wwlksnredwwlkn 26790

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