Theorem oprabv 7208

Description: If a pair and a class are in a relationship given by a class abstraction of a collection of nested ordered pairs, the involved classes are sets. (Contributed by Alexander van der Vekens, 8-Jul-2018.)

Assertion

Ref	Expression
oprabv	⊢ (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V))

Distinct variable groups:   𝑥,𝑋,𝑦,𝑧   𝑥,𝑌,𝑦,𝑧   𝑥,𝑍,𝑦,𝑧

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

Proof of Theorem oprabv

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		reloprab 7207	. . 3 ⊢ Rel {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}
2	1	brrelex12i 5601	. 2 ⊢ (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 → (⟨𝑋, 𝑌⟩ ∈ V ∧ 𝑍 ∈ V))
3		df-br 5059	. . . . 5 ⊢ (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 ↔ ⟨⟨𝑋, 𝑌⟩, 𝑍⟩ ∈ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑})
4		opex 5348	. . . . . . . . 9 ⊢ ⟨𝑋, 𝑌⟩ ∈ V
5		nfcv 2977	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑤⟨𝑋, 𝑌⟩
6	5	nfeq1 2993	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑤⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩
7		nfv 1911	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑤𝜑
8	6, 7	nfan 1896	. . . . . . . . . . . 12 ⊢ Ⅎ𝑤(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)
9	8	nfex 2339	. . . . . . . . . . 11 ⊢ Ⅎ𝑤∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)
10	9	nfex 2339	. . . . . . . . . 10 ⊢ Ⅎ𝑤∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)
11		nfcv 2977	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑧⟨𝑋, 𝑌⟩
12	11	nfeq1 2993	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑧⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩
13		nfsbc1v 3791	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑧[𝑍 / 𝑧]𝜑
14	12, 13	nfan 1896	. . . . . . . . . . . 12 ⊢ Ⅎ𝑧(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)
15	14	nfex 2339	. . . . . . . . . . 11 ⊢ Ⅎ𝑧∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)
16	15	nfex 2339	. . . . . . . . . 10 ⊢ Ⅎ𝑧∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)
17		eqeq1 2825	. . . . . . . . . . . 12 ⊢ (𝑤 = ⟨𝑋, 𝑌⟩ → (𝑤 = ⟨𝑥, 𝑦⟩ ↔ ⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩))
18	17	anbi1d 631	. . . . . . . . . . 11 ⊢ (𝑤 = ⟨𝑋, 𝑌⟩ → ((𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ (⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
19	18	2exbidv 1921	. . . . . . . . . 10 ⊢ (𝑤 = ⟨𝑋, 𝑌⟩ → (∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
20		sbceq1a 3782	. . . . . . . . . . . 12 ⊢ (𝑧 = 𝑍 → (𝜑 ↔ [𝑍 / 𝑧]𝜑))
21	20	anbi2d 630	. . . . . . . . . . 11 ⊢ (𝑧 = 𝑍 → ((⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ (⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)))
22	21	2exbidv 1921	. . . . . . . . . 10 ⊢ (𝑧 = 𝑍 → (∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)))
23	10, 16, 19, 22	opelopabgf 5419	. . . . . . . . 9 ⊢ ((⟨𝑋, 𝑌⟩ ∈ V ∧ 𝑍 ∈ V) → (⟨⟨𝑋, 𝑌⟩, 𝑍⟩ ∈ {⟨𝑤, 𝑧⟩ ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)} ↔ ∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)))
24	4, 23	mpan 688	. . . . . . . 8 ⊢ (𝑍 ∈ V → (⟨⟨𝑋, 𝑌⟩, 𝑍⟩ ∈ {⟨𝑤, 𝑧⟩ ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)} ↔ ∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑)))
25		eqcom 2828	. . . . . . . . . . . . . . 15 ⊢ (⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ↔ ⟨𝑥, 𝑦⟩ = ⟨𝑋, 𝑌⟩)
26		vex 3497	. . . . . . . . . . . . . . . 16 ⊢ 𝑥 ∈ V
27		vex 3497	. . . . . . . . . . . . . . . 16 ⊢ 𝑦 ∈ V
28	26, 27	opth 5360	. . . . . . . . . . . . . . 15 ⊢ (⟨𝑥, 𝑦⟩ = ⟨𝑋, 𝑌⟩ ↔ (𝑥 = 𝑋 ∧ 𝑦 = 𝑌))
29	25, 28	bitri 277	. . . . . . . . . . . . . 14 ⊢ (⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝑥 = 𝑋 ∧ 𝑦 = 𝑌))
30		eqvisset 3511	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑋 → 𝑋 ∈ V)
31		eqvisset 3511	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝑌 → 𝑌 ∈ V)
32	30, 31	anim12i 614	. . . . . . . . . . . . . 14 ⊢ ((𝑥 = 𝑋 ∧ 𝑦 = 𝑌) → (𝑋 ∈ V ∧ 𝑌 ∈ V))
33	29, 32	sylbi 219	. . . . . . . . . . . . 13 ⊢ (⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ → (𝑋 ∈ V ∧ 𝑌 ∈ V))
34	33	adantr 483	. . . . . . . . . . . 12 ⊢ ((⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑) → (𝑋 ∈ V ∧ 𝑌 ∈ V))
35	34	exlimivv 1929	. . . . . . . . . . 11 ⊢ (∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑) → (𝑋 ∈ V ∧ 𝑌 ∈ V))
36	35	anim1i 616	. . . . . . . . . 10 ⊢ ((∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑) ∧ 𝑍 ∈ V) → ((𝑋 ∈ V ∧ 𝑌 ∈ V) ∧ 𝑍 ∈ V))
37		df-3an 1085	. . . . . . . . . 10 ⊢ ((𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V) ↔ ((𝑋 ∈ V ∧ 𝑌 ∈ V) ∧ 𝑍 ∈ V))
38	36, 37	sylibr 236	. . . . . . . . 9 ⊢ ((∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑) ∧ 𝑍 ∈ V) → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V))
39	38	expcom 416	. . . . . . . 8 ⊢ (𝑍 ∈ V → (∃𝑥∃𝑦(⟨𝑋, 𝑌⟩ = ⟨𝑥, 𝑦⟩ ∧ [𝑍 / 𝑧]𝜑) → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
40	24, 39	sylbid 242	. . . . . . 7 ⊢ (𝑍 ∈ V → (⟨⟨𝑋, 𝑌⟩, 𝑍⟩ ∈ {⟨𝑤, 𝑧⟩ ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)} → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
41	40	com12 32	. . . . . 6 ⊢ (⟨⟨𝑋, 𝑌⟩, 𝑍⟩ ∈ {⟨𝑤, 𝑧⟩ ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)} → (𝑍 ∈ V → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
42		dfoprab2 7206	. . . . . 6 ⊢ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨𝑤, 𝑧⟩ ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)}
43	41, 42	eleq2s 2931	. . . . 5 ⊢ (⟨⟨𝑋, 𝑌⟩, 𝑍⟩ ∈ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} → (𝑍 ∈ V → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
44	3, 43	sylbi 219	. . . 4 ⊢ (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 → (𝑍 ∈ V → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
45	44	com12 32	. . 3 ⊢ (𝑍 ∈ V → (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
46	45	adantl 484	. 2 ⊢ ((⟨𝑋, 𝑌⟩ ∈ V ∧ 𝑍 ∈ V) → (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V)))
47	2, 46	mpcom 38	1 ⊢ (⟨𝑋, 𝑌⟩{⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}𝑍 → (𝑋 ∈ V ∧ 𝑌 ∈ V ∧ 𝑍 ∈ V))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∧ w3a 1083   = wceq 1533  ∃wex 1776   ∈ wcel 2110  Vcvv 3494  [wsbc 3771  ⟨cop 4566   class class class wbr 5058  {copab 5120  {coprab 7151

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5195  ax-nul 5202  ax-pr 5321

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-sn 4561  df-pr 4563  df-op 4567  df-br 5059  df-opab 5121  df-xp 5555  df-rel 5556  df-oprab 7154

This theorem is referenced by: (None)