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Theorem rusgrnumwwlkl1 29818

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 12513	. . . . . . . . 9 ⊢ 1 ∈ ℕ₀
2		iswwlksn 29688	. . . . . . . . 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 2725	. . . . . . . . . 10 ⊢ (Edg‘𝐺) = (Edg‘𝐺)
6	4, 5	iswwlks 29686	. . . . . . . . 9 ⊢ (𝑤 ∈ (WWalks‘𝐺) ↔ (𝑤 ≠ ∅ ∧ 𝑤 ∈ Word 𝑉 ∧ ∀𝑖 ∈ (0..^((♯‘𝑤) − 1)){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺)))
7	6	anbi1i 622	. . . . . . . 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 274	. . . . . . 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 629	. . . . 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 12362	. . . . . . . . . . 11 ⊢ (1 + 1) = 2
12	11	eqeq2i 2738	. . . . . . . . . 10 ⊢ ((♯‘𝑤) = (1 + 1) ↔ (♯‘𝑤) = 2)
13	12	a1i 11	. . . . . . . . 9 ⊢ ((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) → ((♯‘𝑤) = (1 + 1) ↔ (♯‘𝑤) = 2))
14	13	anbi2d 628	. . . . . . . 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 1092	. . . . . . . . . . . 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 6890	. . . . . . . . . . . . . . . 16 ⊢ (𝑤 = ∅ → (♯‘𝑤) = (♯‘∅))
18		hash0 14353	. . . . . . . . . . . . . . . 16 ⊢ (♯‘∅) = 0
19	17, 18	eqtrdi 2781	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = ∅ → (♯‘𝑤) = 0)
20		2ne0 12341	. . . . . . . . . . . . . . . . 17 ⊢ 2 ≠ 0
21	20	nesymi 2988	. . . . . . . . . . . . . . . 16 ⊢ ¬ 0 = 2
22		eqeq1 2729	. . . . . . . . . . . . . . . 16 ⊢ ((♯‘𝑤) = 0 → ((♯‘𝑤) = 2 ↔ 0 = 2))
23	21, 22	mtbiri 326	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑤) = 0 → ¬ (♯‘𝑤) = 2)
24	19, 23	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝑤 = ∅ → ¬ (♯‘𝑤) = 2)
25	24	necon2ai 2960	. . . . . . . . . . . . 13 ⊢ ((♯‘𝑤) = 2 → 𝑤 ≠ ∅)
26	25	adantl 480	. . . . . . . . . . . 12 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → 𝑤 ≠ ∅)
27	26	biantrurd 531	. . . . . . . . . . 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 7420	. . . . . . . . . . . . . . . . 17 ⊢ ((♯‘𝑤) = 2 → ((♯‘𝑤) − 1) = (2 − 1))
29		2m1e1 12363	. . . . . . . . . . . . . . . . 17 ⊢ (2 − 1) = 1
30	28, 29	eqtrdi 2781	. . . . . . . . . . . . . . . 16 ⊢ ((♯‘𝑤) = 2 → ((♯‘𝑤) − 1) = 1)
31	30	oveq2d 7429	. . . . . . . . . . . . . . 15 ⊢ ((♯‘𝑤) = 2 → (0..^((♯‘𝑤) − 1)) = (0..^1))
32	31	adantl 480	. . . . . . . . . . . . . 14 ⊢ (((𝐺 RegUSGraph 𝐾 ∧ 𝑃 ∈ 𝑉) ∧ (♯‘𝑤) = 2) → (0..^((♯‘𝑤) − 1)) = (0..^1))
33	32	raleqdv 3315	. . . . . . . . . . . . 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 13741	. . . . . . . . . . . . . . 15 ⊢ (0..^1) = {0}
35	34	raleqi 3313	. . . . . . . . . . . . . 14 ⊢ (∀𝑖 ∈ (0..^1){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ ∀𝑖 ∈ {0} {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺))
36		c0ex 11233	. . . . . . . . . . . . . . 15 ⊢ 0 ∈ V
37		fveq2 6890	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = 0 → (𝑤‘𝑖) = (𝑤‘0))
38		fv0p1e1 12360	. . . . . . . . . . . . . . . . 17 ⊢ (𝑖 = 0 → (𝑤‘(𝑖 + 1)) = (𝑤‘1))
39	37, 38	preq12d 4742	. . . . . . . . . . . . . . . 16 ⊢ (𝑖 = 0 → {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} = {(𝑤‘0), (𝑤‘1)})
40	39	eleq1d 2810	. . . . . . . . . . . . . . 15 ⊢ (𝑖 = 0 → ({(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺)))
41	36, 40	ralsn 4682	. . . . . . . . . . . . . 14 ⊢ (∀𝑖 ∈ {0} {(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))
42	35, 41	bitri 274	. . . . . . . . . . . . 13 ⊢ (∀𝑖 ∈ (0..^1){(𝑤‘𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝐺) ↔ {(𝑤‘0), (𝑤‘1)} ∈ (Edg‘𝐺))
43	33, 42	bitrdi 286	. . . . . . . . . . . 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 628	. . . . . . . . . . 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 306	. . . . . . . . . 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 411	. . . . . . . . 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 576	. . . . . . . 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 278	. . . . . . 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 629	. . . . . 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 467	. . . . . 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 286	. . . . 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 467	. . . . . . 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 459	. . . . . . . . 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 1086	. . . . . . . . 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 277	. . . . . . . 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 621	. . . . . . 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 274	. . . . . 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 304	. . . 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 3421	. . 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 6894	. 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 29439	. 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 2765	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 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 ∀wral 3051 {crab 3419 ∅c0 4319 {csn 4625 {cpr 4627 class class class wbr 5144 ‘cfv 6543 (class class class)co 7413 0cc0 11133 1c1 11134 + caddc 11136 − cmin 11469 2c2 12292 ℕ₀cn0 12497 ..^cfzo 13654 ♯chash 14316 Word cword 14491 Vtxcvtx 28848 Edgcedg 28899 RegUSGraph crusgr 29409 WWalkscwwlks 29675 WWalksN cwwlksn 29676

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5281 ax-sep 5295 ax-nul 5302 ax-pow 5360 ax-pr 5424 ax-un 7735 ax-cnex 11189 ax-resscn 11190 ax-1cn 11191 ax-icn 11192 ax-addcl 11193 ax-addrcl 11194 ax-mulcl 11195 ax-mulrcl 11196 ax-mulcom 11197 ax-addass 11198 ax-mulass 11199 ax-distr 11200 ax-i2m1 11201 ax-1ne0 11202 ax-1rid 11203 ax-rnegex 11204 ax-rrecex 11205 ax-cnre 11206 ax-pre-lttri 11207 ax-pre-lttrn 11208 ax-pre-ltadd 11209 ax-pre-mulgt0 11210

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3771 df-csb 3887 df-dif 3944 df-un 3946 df-in 3948 df-ss 3958 df-pss 3961 df-nul 4320 df-if 4526 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4905 df-int 4946 df-iun 4994 df-br 5145 df-opab 5207 df-mpt 5228 df-tr 5262 df-id 5571 df-eprel 5577 df-po 5585 df-so 5586 df-fr 5628 df-we 5630 df-xp 5679 df-rel 5680 df-cnv 5681 df-co 5682 df-dm 5683 df-rn 5684 df-res 5685 df-ima 5686 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 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 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7866 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-2o 8481 df-oadd 8484 df-er 8718 df-map 8840 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-dju 9919 df-card 9957 df-pnf 11275 df-mnf 11276 df-xr 11277 df-ltxr 11278 df-le 11279 df-sub 11471 df-neg 11472 df-nn 12238 df-2 12300 df-n0 12498 df-xnn0 12570 df-z 12584 df-uz 12848 df-xadd 13120 df-fz 13512 df-fzo 13655 df-hash 14317 df-word 14492 df-edg 28900 df-uhgr 28910 df-ushgr 28911 df-upgr 28934 df-umgr 28935 df-uspgr 29002 df-usgr 29003 df-nbgr 29185 df-vtxdg 29319 df-rgr 29410 df-rusgr 29411 df-wwlks 29680 df-wwlksn 29681

This theorem is referenced by: rusgrnumwwlkb1 29822

W3C validator