4fvwrd4 - Intuitionistic Logic Explorer

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Theorem 4fvwrd4 10297

Description: The first four function values of a word of length at least 4. (Contributed by Alexander van der Vekens, 18-Nov-2017.)

**Assertion**
Ref	Expression
4fvwrd4	⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 ∃𝑐 ∈ 𝑉 ∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)))

Distinct variable groups: 𝑃,𝑎,𝑏,𝑐,𝑑 𝑉,𝑎,𝑏,𝑐,𝑑 Allowed substitution hints: 𝐿(𝑎,𝑏,𝑐,𝑑)

**Proof of Theorem 4fvwrd4**
Step	Hyp	Ref	Expression
1		simpr 110	. . . . . 6 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → 𝑃:(0...𝐿)⟶𝑉)
2		0nn0 9345	. . . . . . . . 9 ⊢ 0 ∈ ℕ₀
3		elnn0uz 9721	. . . . . . . . 9 ⊢ (0 ∈ ℕ₀ ↔ 0 ∈ (ℤ_≥‘0))
4	2, 3	mpbi 145	. . . . . . . 8 ⊢ 0 ∈ (ℤ_≥‘0)
5		3nn0 9348	. . . . . . . . . . 11 ⊢ 3 ∈ ℕ₀
6		elnn0uz 9721	. . . . . . . . . . 11 ⊢ (3 ∈ ℕ₀ ↔ 3 ∈ (ℤ_≥‘0))
7	5, 6	mpbi 145	. . . . . . . . . 10 ⊢ 3 ∈ (ℤ_≥‘0)
8		uzss 9704	. . . . . . . . . 10 ⊢ (3 ∈ (ℤ_≥‘0) → (ℤ_≥‘3) ⊆ (ℤ_≥‘0))
9	7, 8	ax-mp 5	. . . . . . . . 9 ⊢ (ℤ_≥‘3) ⊆ (ℤ_≥‘0)
10	9	sseli 3197	. . . . . . . 8 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 𝐿 ∈ (ℤ_≥‘0))
11		eluzfz 10177	. . . . . . . 8 ⊢ ((0 ∈ (ℤ_≥‘0) ∧ 𝐿 ∈ (ℤ_≥‘0)) → 0 ∈ (0...𝐿))
12	4, 10, 11	sylancr 414	. . . . . . 7 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 0 ∈ (0...𝐿))
13	12	adantr 276	. . . . . 6 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → 0 ∈ (0...𝐿))
14	1, 13	ffvelcdmd 5739	. . . . 5 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → (𝑃‘0) ∈ 𝑉)
15		risset 2536	. . . . . 6 ⊢ ((𝑃‘0) ∈ 𝑉 ↔ ∃𝑎 ∈ 𝑉 𝑎 = (𝑃‘0))
16		eqcom 2209	. . . . . . 7 ⊢ (𝑎 = (𝑃‘0) ↔ (𝑃‘0) = 𝑎)
17	16	rexbii 2515	. . . . . 6 ⊢ (∃𝑎 ∈ 𝑉 𝑎 = (𝑃‘0) ↔ ∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎)
18	15, 17	bitri 184	. . . . 5 ⊢ ((𝑃‘0) ∈ 𝑉 ↔ ∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎)
19	14, 18	sylib 122	. . . 4 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎)
20		1eluzge0 9730	. . . . . . . 8 ⊢ 1 ∈ (ℤ_≥‘0)
21		1z 9433	. . . . . . . . . . 11 ⊢ 1 ∈ ℤ
22		3z 9436	. . . . . . . . . . 11 ⊢ 3 ∈ ℤ
23		1le3 9283	. . . . . . . . . . 11 ⊢ 1 ≤ 3
24		eluz2 9689	. . . . . . . . . . 11 ⊢ (3 ∈ (ℤ_≥‘1) ↔ (1 ∈ ℤ ∧ 3 ∈ ℤ ∧ 1 ≤ 3))
25	21, 22, 23, 24	mpbir3an 1182	. . . . . . . . . 10 ⊢ 3 ∈ (ℤ_≥‘1)
26		uzss 9704	. . . . . . . . . 10 ⊢ (3 ∈ (ℤ_≥‘1) → (ℤ_≥‘3) ⊆ (ℤ_≥‘1))
27	25, 26	ax-mp 5	. . . . . . . . 9 ⊢ (ℤ_≥‘3) ⊆ (ℤ_≥‘1)
28	27	sseli 3197	. . . . . . . 8 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 𝐿 ∈ (ℤ_≥‘1))
29		eluzfz 10177	. . . . . . . 8 ⊢ ((1 ∈ (ℤ_≥‘0) ∧ 𝐿 ∈ (ℤ_≥‘1)) → 1 ∈ (0...𝐿))
30	20, 28, 29	sylancr 414	. . . . . . 7 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 1 ∈ (0...𝐿))
31	30	adantr 276	. . . . . 6 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → 1 ∈ (0...𝐿))
32	1, 31	ffvelcdmd 5739	. . . . 5 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → (𝑃‘1) ∈ 𝑉)
33		risset 2536	. . . . . 6 ⊢ ((𝑃‘1) ∈ 𝑉 ↔ ∃𝑏 ∈ 𝑉 𝑏 = (𝑃‘1))
34		eqcom 2209	. . . . . . 7 ⊢ (𝑏 = (𝑃‘1) ↔ (𝑃‘1) = 𝑏)
35	34	rexbii 2515	. . . . . 6 ⊢ (∃𝑏 ∈ 𝑉 𝑏 = (𝑃‘1) ↔ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏)
36	33, 35	bitri 184	. . . . 5 ⊢ ((𝑃‘1) ∈ 𝑉 ↔ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏)
37	32, 36	sylib 122	. . . 4 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏)
38	19, 37	jca 306	. . 3 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → (∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏))
39		2eluzge0 9731	. . . . . . 7 ⊢ 2 ∈ (ℤ_≥‘0)
40		uzuzle23 9727	. . . . . . 7 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 𝐿 ∈ (ℤ_≥‘2))
41		eluzfz 10177	. . . . . . 7 ⊢ ((2 ∈ (ℤ_≥‘0) ∧ 𝐿 ∈ (ℤ_≥‘2)) → 2 ∈ (0...𝐿))
42	39, 40, 41	sylancr 414	. . . . . 6 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 2 ∈ (0...𝐿))
43	42	adantr 276	. . . . 5 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → 2 ∈ (0...𝐿))
44	1, 43	ffvelcdmd 5739	. . . 4 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → (𝑃‘2) ∈ 𝑉)
45		risset 2536	. . . . 5 ⊢ ((𝑃‘2) ∈ 𝑉 ↔ ∃𝑐 ∈ 𝑉 𝑐 = (𝑃‘2))
46		eqcom 2209	. . . . . 6 ⊢ (𝑐 = (𝑃‘2) ↔ (𝑃‘2) = 𝑐)
47	46	rexbii 2515	. . . . 5 ⊢ (∃𝑐 ∈ 𝑉 𝑐 = (𝑃‘2) ↔ ∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐)
48	45, 47	bitri 184	. . . 4 ⊢ ((𝑃‘2) ∈ 𝑉 ↔ ∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐)
49	44, 48	sylib 122	. . 3 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐)
50		eluzfz 10177	. . . . . . 7 ⊢ ((3 ∈ (ℤ_≥‘0) ∧ 𝐿 ∈ (ℤ_≥‘3)) → 3 ∈ (0...𝐿))
51	7, 50	mpan 424	. . . . . 6 ⊢ (𝐿 ∈ (ℤ_≥‘3) → 3 ∈ (0...𝐿))
52	51	adantr 276	. . . . 5 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → 3 ∈ (0...𝐿))
53	1, 52	ffvelcdmd 5739	. . . 4 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → (𝑃‘3) ∈ 𝑉)
54		risset 2536	. . . . 5 ⊢ ((𝑃‘3) ∈ 𝑉 ↔ ∃𝑑 ∈ 𝑉 𝑑 = (𝑃‘3))
55		eqcom 2209	. . . . . 6 ⊢ (𝑑 = (𝑃‘3) ↔ (𝑃‘3) = 𝑑)
56	55	rexbii 2515	. . . . 5 ⊢ (∃𝑑 ∈ 𝑉 𝑑 = (𝑃‘3) ↔ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)
57	54, 56	bitri 184	. . . 4 ⊢ ((𝑃‘3) ∈ 𝑉 ↔ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)
58	53, 57	sylib 122	. . 3 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)
59	38, 49, 58	jca32 310	. 2 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ((∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
60		r19.42v 2665	. . . . . 6 ⊢ (∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ∃𝑑 ∈ 𝑉 ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)))
61		r19.42v 2665	. . . . . . 7 ⊢ (∃𝑑 ∈ 𝑉 ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑) ↔ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑))
62	61	anbi2i 457	. . . . . 6 ⊢ ((((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ∃𝑑 ∈ 𝑉 ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
63	60, 62	bitri 184	. . . . 5 ⊢ (∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
64	63	rexbii 2515	. . . 4 ⊢ (∃𝑐 ∈ 𝑉 ∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)) ↔ ∃𝑐 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
65	64	2rexbii 2517	. . 3 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 ∃𝑐 ∈ 𝑉 ∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 ∃𝑐 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
66		r19.42v 2665	. . . . 5 ⊢ (∃𝑐 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ∃𝑐 ∈ 𝑉 ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
67		r19.41v 2664	. . . . . 6 ⊢ (∃𝑐 ∈ 𝑉 ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑) ↔ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑))
68	67	anbi2i 457	. . . . 5 ⊢ ((((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ∃𝑐 ∈ 𝑉 ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
69	66, 68	bitri 184	. . . 4 ⊢ (∃𝑐 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
70	69	2rexbii 2517	. . 3 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 ∃𝑐 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
71		r19.41v 2664	. . . . . 6 ⊢ (∃𝑏 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (∃𝑏 ∈ 𝑉 ((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
72		r19.42v 2665	. . . . . . 7 ⊢ (∃𝑏 ∈ 𝑉 ((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ↔ ((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏))
73	72	anbi1i 458	. . . . . 6 ⊢ ((∃𝑏 ∈ 𝑉 ((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
74	71, 73	bitri 184	. . . . 5 ⊢ (∃𝑏 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
75	74	rexbii 2515	. . . 4 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ ∃𝑎 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
76		r19.41v 2664	. . . 4 ⊢ (∃𝑎 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ (∃𝑎 ∈ 𝑉 ((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
77		r19.41v 2664	. . . . 5 ⊢ (∃𝑎 ∈ 𝑉 ((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ↔ (∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏))
78	77	anbi1i 458	. . . 4 ⊢ ((∃𝑎 ∈ 𝑉 ((𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ ((∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
79	75, 76, 78	3bitri 206	. . 3 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)) ↔ ((∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
80	65, 70, 79	3bitri 206	. 2 ⊢ (∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 ∃𝑐 ∈ 𝑉 ∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)) ↔ ((∃𝑎 ∈ 𝑉 (𝑃‘0) = 𝑎 ∧ ∃𝑏 ∈ 𝑉 (𝑃‘1) = 𝑏) ∧ (∃𝑐 ∈ 𝑉 (𝑃‘2) = 𝑐 ∧ ∃𝑑 ∈ 𝑉 (𝑃‘3) = 𝑑)))
81	59, 80	sylibr 134	1 ⊢ ((𝐿 ∈ (ℤ_≥‘3) ∧ 𝑃:(0...𝐿)⟶𝑉) → ∃𝑎 ∈ 𝑉 ∃𝑏 ∈ 𝑉 ∃𝑐 ∈ 𝑉 ∃𝑑 ∈ 𝑉 (((𝑃‘0) = 𝑎 ∧ (𝑃‘1) = 𝑏) ∧ ((𝑃‘2) = 𝑐 ∧ (𝑃‘3) = 𝑑)))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 = wceq 1373 ∈ wcel 2178 ∃wrex 2487 ⊆ wss 3174 class class class wbr 4059 ⟶wf 5286 ‘cfv 5290 (class class class)co 5967 0cc0 7960 1c1 7961 ≤ cle 8143 2c2 9122 3c3 9123 ℕ₀cn0 9330 ℤcz 9407 ℤ_≥cuz 9683 ...cfz 10165

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2180 ax-14 2181 ax-ext 2189 ax-sep 4178 ax-pow 4234 ax-pr 4269 ax-un 4498 ax-setind 4603 ax-cnex 8051 ax-resscn 8052 ax-1cn 8053 ax-1re 8054 ax-icn 8055 ax-addcl 8056 ax-addrcl 8057 ax-mulcl 8058 ax-addcom 8060 ax-addass 8062 ax-distr 8064 ax-i2m1 8065 ax-0lt1 8066 ax-0id 8068 ax-rnegex 8069 ax-cnre 8071 ax-pre-ltirr 8072 ax-pre-ltwlin 8073 ax-pre-lttrn 8074 ax-pre-ltadd 8076

This theorem depends on definitions: df-bi 117 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ne 2379 df-nel 2474 df-ral 2491 df-rex 2492 df-reu 2493 df-rab 2495 df-v 2778 df-sbc 3006 df-dif 3176 df-un 3178 df-in 3180 df-ss 3187 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-uni 3865 df-int 3900 df-br 4060 df-opab 4122 df-mpt 4123 df-id 4358 df-xp 4699 df-rel 4700 df-cnv 4701 df-co 4702 df-dm 4703 df-rn 4704 df-res 4705 df-ima 4706 df-iota 5251 df-fun 5292 df-fn 5293 df-f 5294 df-fv 5298 df-riota 5922 df-ov 5970 df-oprab 5971 df-mpo 5972 df-pnf 8144 df-mnf 8145 df-xr 8146 df-ltxr 8147 df-le 8148 df-sub 8280 df-neg 8281 df-inn 9072 df-2 9130 df-3 9131 df-n0 9331 df-z 9408 df-uz 9684 df-fz 10166

This theorem is referenced by: (None)

W3C validator