Theorem ralxpf 5826

Description: Version of ralxp 5821 with bound-variable hypotheses. (Contributed by NM, 18-Aug-2006.) (Revised by Mario Carneiro, 15-Oct-2016.)

Hypotheses

Ref	Expression
ralxpf.1	⊢ Ⅎ𝑦𝜑
ralxpf.2	⊢ Ⅎ𝑧𝜑
ralxpf.3	⊢ Ⅎ𝑥𝜓
ralxpf.4	⊢ (𝑥 = ⟨𝑦, 𝑧⟩ → (𝜑 ↔ 𝜓))

Assertion

Ref	Expression
ralxpf	⊢ (∀𝑥 ∈ (𝐴 × 𝐵)𝜑 ↔ ∀𝑦 ∈ 𝐴 ∀𝑧 ∈ 𝐵 𝜓)

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝑧,𝐵,𝑦

Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧)   𝜓(𝑥,𝑦,𝑧)   𝐴(𝑧)

Proof of Theorem ralxpf

Dummy variables 𝑣 𝑢 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cbvralsvw 3296	. 2 ⊢ (∀𝑥 ∈ (𝐴 × 𝐵)𝜑 ↔ ∀𝑤 ∈ (𝐴 × 𝐵)[𝑤 / 𝑥]𝜑)
2		cbvralsvw 3296	. . . 4 ⊢ (∀𝑧 ∈ 𝐵 [𝑢 / 𝑦]𝜓 ↔ ∀𝑣 ∈ 𝐵 [𝑣 / 𝑧][𝑢 / 𝑦]𝜓)
3	2	ralbii 3082	. . 3 ⊢ (∀𝑢 ∈ 𝐴 ∀𝑧 ∈ 𝐵 [𝑢 / 𝑦]𝜓 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 [𝑣 / 𝑧][𝑢 / 𝑦]𝜓)
4		nfv 1914	. . . 4 ⊢ Ⅎ𝑢∀𝑧 ∈ 𝐵 𝜓
5		nfcv 2898	. . . . 5 ⊢ Ⅎ𝑦𝐵
6		nfs1v 2156	. . . . 5 ⊢ Ⅎ𝑦[𝑢 / 𝑦]𝜓
7	5, 6	nfralw 3291	. . . 4 ⊢ Ⅎ𝑦∀𝑧 ∈ 𝐵 [𝑢 / 𝑦]𝜓
8		sbequ12 2251	. . . . 5 ⊢ (𝑦 = 𝑢 → (𝜓 ↔ [𝑢 / 𝑦]𝜓))
9	8	ralbidv 3163	. . . 4 ⊢ (𝑦 = 𝑢 → (∀𝑧 ∈ 𝐵 𝜓 ↔ ∀𝑧 ∈ 𝐵 [𝑢 / 𝑦]𝜓))
10	4, 7, 9	cbvralw 3286	. . 3 ⊢ (∀𝑦 ∈ 𝐴 ∀𝑧 ∈ 𝐵 𝜓 ↔ ∀𝑢 ∈ 𝐴 ∀𝑧 ∈ 𝐵 [𝑢 / 𝑦]𝜓)
11		vex 3463	. . . . . 6 ⊢ 𝑢 ∈ V
12		vex 3463	. . . . . 6 ⊢ 𝑣 ∈ V
13	11, 12	eqvinop 5462	. . . . 5 ⊢ (𝑤 = ⟨𝑢, 𝑣⟩ ↔ ∃𝑦∃𝑧(𝑤 = ⟨𝑦, 𝑧⟩ ∧ ⟨𝑦, 𝑧⟩ = ⟨𝑢, 𝑣⟩))
14		ralxpf.1	. . . . . . . 8 ⊢ Ⅎ𝑦𝜑
15	14	nfsbv 2330	. . . . . . 7 ⊢ Ⅎ𝑦[𝑤 / 𝑥]𝜑
16	6	nfsbv 2330	. . . . . . 7 ⊢ Ⅎ𝑦[𝑣 / 𝑧][𝑢 / 𝑦]𝜓
17	15, 16	nfbi 1903	. . . . . 6 ⊢ Ⅎ𝑦([𝑤 / 𝑥]𝜑 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓)
18		ralxpf.2	. . . . . . . . 9 ⊢ Ⅎ𝑧𝜑
19	18	nfsbv 2330	. . . . . . . 8 ⊢ Ⅎ𝑧[𝑤 / 𝑥]𝜑
20		nfs1v 2156	. . . . . . . 8 ⊢ Ⅎ𝑧[𝑣 / 𝑧][𝑢 / 𝑦]𝜓
21	19, 20	nfbi 1903	. . . . . . 7 ⊢ Ⅎ𝑧([𝑤 / 𝑥]𝜑 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓)
22		ralxpf.3	. . . . . . . . 9 ⊢ Ⅎ𝑥𝜓
23		ralxpf.4	. . . . . . . . 9 ⊢ (𝑥 = ⟨𝑦, 𝑧⟩ → (𝜑 ↔ 𝜓))
24	22, 23	sbhypf 3523	. . . . . . . 8 ⊢ (𝑤 = ⟨𝑦, 𝑧⟩ → ([𝑤 / 𝑥]𝜑 ↔ 𝜓))
25		vex 3463	. . . . . . . . . 10 ⊢ 𝑦 ∈ V
26		vex 3463	. . . . . . . . . 10 ⊢ 𝑧 ∈ V
27	25, 26	opth 5451	. . . . . . . . 9 ⊢ (⟨𝑦, 𝑧⟩ = ⟨𝑢, 𝑣⟩ ↔ (𝑦 = 𝑢 ∧ 𝑧 = 𝑣))
28		sbequ12 2251	. . . . . . . . . 10 ⊢ (𝑧 = 𝑣 → ([𝑢 / 𝑦]𝜓 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
29	8, 28	sylan9bb 509	. . . . . . . . 9 ⊢ ((𝑦 = 𝑢 ∧ 𝑧 = 𝑣) → (𝜓 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
30	27, 29	sylbi 217	. . . . . . . 8 ⊢ (⟨𝑦, 𝑧⟩ = ⟨𝑢, 𝑣⟩ → (𝜓 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
31	24, 30	sylan9bb 509	. . . . . . 7 ⊢ ((𝑤 = ⟨𝑦, 𝑧⟩ ∧ ⟨𝑦, 𝑧⟩ = ⟨𝑢, 𝑣⟩) → ([𝑤 / 𝑥]𝜑 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
32	21, 31	exlimi 2217	. . . . . 6 ⊢ (∃𝑧(𝑤 = ⟨𝑦, 𝑧⟩ ∧ ⟨𝑦, 𝑧⟩ = ⟨𝑢, 𝑣⟩) → ([𝑤 / 𝑥]𝜑 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
33	17, 32	exlimi 2217	. . . . 5 ⊢ (∃𝑦∃𝑧(𝑤 = ⟨𝑦, 𝑧⟩ ∧ ⟨𝑦, 𝑧⟩ = ⟨𝑢, 𝑣⟩) → ([𝑤 / 𝑥]𝜑 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
34	13, 33	sylbi 217	. . . 4 ⊢ (𝑤 = ⟨𝑢, 𝑣⟩ → ([𝑤 / 𝑥]𝜑 ↔ [𝑣 / 𝑧][𝑢 / 𝑦]𝜓))
35	34	ralxp 5821	. . 3 ⊢ (∀𝑤 ∈ (𝐴 × 𝐵)[𝑤 / 𝑥]𝜑 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 [𝑣 / 𝑧][𝑢 / 𝑦]𝜓)
36	3, 10, 35	3bitr4ri 304	. 2 ⊢ (∀𝑤 ∈ (𝐴 × 𝐵)[𝑤 / 𝑥]𝜑 ↔ ∀𝑦 ∈ 𝐴 ∀𝑧 ∈ 𝐵 𝜓)
37	1, 36	bitri 275	1 ⊢ (∀𝑥 ∈ (𝐴 × 𝐵)𝜑 ↔ ∀𝑦 ∈ 𝐴 ∀𝑧 ∈ 𝐵 𝜓)

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540  ∃wex 1779  Ⅎwnf 1783  [wsb 2064  ∀wral 3051  ⟨cop 4607   × cxp 5652

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2707  ax-sep 5266  ax-nul 5276  ax-pr 5402

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-clab 2714  df-cleq 2727  df-clel 2809  df-nfc 2885  df-ral 3052  df-rex 3061  df-rab 3416  df-v 3461  df-sbc 3766  df-csb 3875  df-dif 3929  df-un 3931  df-ss 3943  df-nul 4309  df-if 4501  df-sn 4602  df-pr 4604  df-op 4608  df-iun 4969  df-opab 5182  df-xp 5660  df-rel 5661

This theorem is referenced by:  rexxpf  5827  ralxpes  8135  frpoins3xpg  8139