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Theorem rusgrnumwwlkl1 29212

Description: In a k-regular graph, there are k walks (as word) of length 1 starting at each vertex. (Contributed by Alexander van der Vekens, 28-Jul-2018.) (Revised by AV, 7-May-2021.)

**Hypothesis**
Ref	Expression
rusgrnumwwlkl1.v	⊢ 𝑉 = (Vtx‘𝐺)

**Assertion**
Ref	Expression
rusgrnumwwlkl1	⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (♯‘{𝑤 ∈ (1 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃}) = 𝐾)

Distinct variable groups: 𝑤,𝐺 𝑤,𝐾 𝑤,𝑃 𝑤,𝑉

Proof of Theorem rusgrnumwwlkl1 Dummy variable 𝑖 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		1nn0 12485	. . . . . . . . 9 ⊢ 1 ∈ ℕ₀
2		iswwlksn 29082	. . . . . . . . 9 ⊢ (1 ∈ ℕ₀ → (𝑤 ∈ (1 WWalksN 𝐺) ↔ (𝑤 ∈ (WWalks‘𝐺) ∧ (♯‘𝑤) = (1 + 1))))
3	1, 2	ax-mp 5	. . . . . . . 8 ⊢ (𝑤 ∈ (1 WWalksN 𝐺) ↔ (𝑤 ∈ (WWalks‘𝐺) ∧ (♯‘𝑤) = (1 + 1)))
4		rusgrnumwwlkl1.v	. . . . . . . . . 10 ⊢ 𝑉 = (Vtx‘𝐺)
5		eqid 2733	. . . . . . . . . 10 ⊢ (Edg‘𝐺) = (Edg‘𝐺)
6	4, 5	iswwlks 29080	. . . . . . . . 9 ⊢ (𝑤 ∈ (WWalks‘𝐺) ↔ (𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
7	6	anbi1i 625	. . . . . . . 8 ⊢ ((𝑤 ∈ (WWalks‘𝐺) ∧ (♯‘𝑤) = (1 + 1)) ↔ ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)))
8	3, 7	bitri 275	. . . . . . 7 ⊢ (𝑤 ∈ (1 WWalksN 𝐺) ↔ ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)))
9	8	a1i 11	. . . . . 6 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (𝑤 ∈ (1 WWalksN 𝐺) ↔ ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1))))
10	9	anbi1d 631	. . . . 5 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((𝑤 ∈ (1 WWalksN 𝐺) ∧ (𝑤‘0) = 𝑃) ↔ (((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)) ∧ (𝑤‘0) = 𝑃)))
11		1p1e2 12334	. . . . . . . . . . 11 ⊢ (1 + 1) = 2
12	11	eqeq2i 2746	. . . . . . . . . 10 ⊢ ((♯‘𝑤) = (1 + 1) ↔ (♯‘𝑤) = 2)
13	12	a1i 11	. . . . . . . . 9 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((♯‘𝑤) = (1 + 1) ↔ (♯‘𝑤) = 2))
14	13	anbi2d 630	. . . . . . . 8 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)) ↔ ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = 2)))
15		3anass 1096	. . . . . . . . . . . 12 ⊢ ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ↔ (𝑤 ≠ ∅ ∧ (𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺))))
16	15	a1i 11	. . . . . . . . . . 11 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ↔ (𝑤 ≠ ∅ ∧ (𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)))))
17		fveq2 6889	. . . . . . . . . . . . . . . 16 ⊢ (𝑤 = ∅ → (♯‘𝑤) = (♯‘∅))
18		hash0 14324	. . . . . . . . . . . . . . . 16 ⊢ (♯‘∅) = 0
19	17, 18	eqtrdi 2789	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = ∅ → (♯‘𝑤) = 0)
20		2ne0 12313	. . . . . . . . . . . . . . . . 17 ⊢ 2 ≠ 0
21	20	nesymi 2999	. . . . . . . . . . . . . . . 16 ⊢ ¬ 0 = 2
22		eqeq1 2737	. . . . . . . . . . . . . . . 16 ⊢ ((♯‘𝑤) = 0 → ((♯‘𝑤) = 2 ↔ 0 = 2))
23	21, 22	mtbiri 327	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑤) = 0 → ¬ (♯‘𝑤) = 2)
24	19, 23	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝑤 = ∅ → ¬ (♯‘𝑤) = 2)
25	24	necon2ai 2971	. . . . . . . . . . . . 13 ⊢ ((♯‘𝑤) = 2 → 𝑤 ≠ ∅)
26	25	adantl 483	. . . . . . . . . . . 12 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → 𝑤 ≠ ∅)
27	26	biantrurd 534	. . . . . . . . . . 11 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → ((𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ↔ (𝑤 ≠ ∅ ∧ (𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)))))
28		oveq1 7413	. . . . . . . . . . . . . . . . 17 ⊢ ((♯‘𝑤) = 2 → ((♯‘𝑤) − 1) = (2 − 1))
29		2m1e1 12335	. . . . . . . . . . . . . . . . 17 ⊢ (2 − 1) = 1
30	28, 29	eqtrdi 2789	. . . . . . . . . . . . . . . 16 ⊢ ((♯‘𝑤) = 2 → ((♯‘𝑤) − 1) = 1)
31	30	oveq2d 7422	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑤) = 2 → (0..^((♯‘𝑤) − 1)) = (0..^1))
32	31	adantl 483	. . . . . . . . . . . . . 14 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → (0..^((♯‘𝑤) − 1)) = (0..^1))
33	32	raleqdv 3326	. . . . . . . . . . . . 13 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → (∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ (0..^1){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
34		fzo01 13711	. . . . . . . . . . . . . . 15 ⊢ (0..^1) = {0}
35	34	raleqi 3324	. . . . . . . . . . . . . 14 ⊢ (∀𝑖 ∈ (0..^1){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ {0} {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺))
36		c0ex 11205	. . . . . . . . . . . . . . 15 ⊢ 0 ∈ V
37		fveq2 6889	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = 0 → (𝑤‘𝑖) = (𝑤‘0))
38		fv0p1e1 12332	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = 0 → (𝑤‘(𝑖 + 1)) = (𝑤‘1))
39	37, 38	preq12d 4745	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = 0 → {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} = {(𝑤‘0), (𝑤‘1)})
40	39	eleq1d 2819	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = 0 → ({(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))
41	36, 40	ralsn 4685	. . . . . . . . . . . . . 14 ⊢ (∀𝑖 ∈ {0} {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))
42	35, 41	bitri 275	. . . . . . . . . . . . 13 ⊢ (∀𝑖 ∈ (0..^1){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))
43	33, 42	bitrdi 287	. . . . . . . . . . . 12 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → (∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))
44	43	anbi2d 630	. . . . . . . . . . 11 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → ((𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ↔ (𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))))
45	16, 27, 44	3bitr2d 307	. . . . . . . . . 10 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ↔ (𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))))
46	45	ex 414	. . . . . . . . 9 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((♯‘𝑤) = 2 → ((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ↔ (𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))))
47	46	pm5.32rd 579	. . . . . . . 8 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = 2) ↔ ((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = 2)))
48	14, 47	bitrd 279	. . . . . . 7 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)) ↔ ((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = 2)))
49	48	anbi1d 631	. . . . . 6 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)) ∧ (𝑤‘0) = 𝑃) ↔ (((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = 2) ∧ (𝑤‘0) = 𝑃)))
50		anass 470	. . . . . 6 ⊢ ((((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = 2) ∧ (𝑤‘0) = 𝑃) ↔ ((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃)))
51	49, 50	bitrdi 287	. . . . 5 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((((𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)) ∧ (♯‘𝑤) = (1 + 1)) ∧ (𝑤‘0) = 𝑃) ↔ ((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃))))
52		anass 470	. . . . . . 7 ⊢ (((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃)) ↔ (𝑤 ∈ Word 𝑉 ∧ ({(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃))))
53		ancom 462	. . . . . . . . 9 ⊢ (({(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃)) ↔ (((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃) ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))
54		df-3an 1090	. . . . . . . . 9 ⊢ (((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ↔ (((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃) ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))
55	53, 54	bitr4i 278	. . . . . . . 8 ⊢ (({(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃)) ↔ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))
56	55	anbi2i 624	. . . . . . 7 ⊢ ((𝑤 ∈ Word 𝑉 ∧ ({(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃))) ↔ (𝑤 ∈ Word 𝑉 ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))))
57	52, 56	bitri 275	. . . . . 6 ⊢ (((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃)) ↔ (𝑤 ∈ Word 𝑉 ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))))
58	57	a1i 11	. . . . 5 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (((𝑤 ∈ Word 𝑉 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)) ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃)) ↔ (𝑤 ∈ Word 𝑉 ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))))
59	10, 51, 58	3bitrd 305	. . . 4 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((𝑤 ∈ (1 WWalksN 𝐺) ∧ (𝑤‘0) = 𝑃) ↔ (𝑤 ∈ Word 𝑉 ∧ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))))
60	59	rabbidva2 3435	. . 3 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → {𝑤 ∈ (1 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃} = {𝑤 ∈ Word 𝑉 ∣ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))})
61	60	fveq2d 6893	. 2 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (♯‘{𝑤 ∈ (1 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃}) = (♯‘{𝑤 ∈ Word 𝑉 ∣ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))}))
62	4	rusgrnumwrdl2 28833	. 2 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (♯‘{𝑤 ∈ Word 𝑉 ∣ ((♯‘𝑤) = 2 ∧ (𝑤‘0) = 𝑃 ∧ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))}) = 𝐾)
63	61, 62	eqtrd 2773	1 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → (♯‘{𝑤 ∈ (1 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃}) = 𝐾)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ∀wral 3062 {crab 3433 ∅c0 4322 {csn 4628 {cpr 4630 class class class wbr 5148 ‘cfv 6541 (class class class)co 7406 0cc0 11107 1c1 11108 + caddc 11110 − cmin 11441 2c2 12264 ℕ₀cn0 12469 ..^cfzo 13624 ♯chash 14287 Word cword 14461 Vtxcvtx 28246 Edgcedg 28297 RegUSGraph crusgr 28803 WWalkscwwlks 29069 WWalksN cwwlksn 29070

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 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 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-om 7853 df-1st 7972 df-2nd 7973 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-2o 8464 df-oadd 8467 df-er 8700 df-map 8819 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-dju 9893 df-card 9931 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-nn 12210 df-2 12272 df-n0 12470 df-xnn0 12542 df-z 12556 df-uz 12820 df-xadd 13090 df-fz 13482 df-fzo 13625 df-hash 14288 df-word 14462 df-edg 28298 df-uhgr 28308 df-ushgr 28309 df-upgr 28332 df-umgr 28333 df-uspgr 28400 df-usgr 28401 df-nbgr 28580 df-vtxdg 28713 df-rgr 28804 df-rusgr 28805 df-wwlks 29074 df-wwlksn 29075

This theorem is referenced by: rusgrnumwwlkb1 29216

W3C validator