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Theorem copsexg 5092
 Description: Substitution of class 𝐴 for ordered pair ⟨𝑥, 𝑦⟩. (Contributed by NM, 27-Dec-1996.) (Revised by Andrew Salmon, 11-Jul-2011.) (Proof shortened by Wolf Lammen, 25-Aug-2019.)
Assertion
Ref Expression
copsexg (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
Distinct variable groups:   𝑥,𝐴   𝑦,𝐴
Allowed substitution hints:   𝜑(𝑥,𝑦)

Proof of Theorem copsexg
Dummy variables 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 vex 3331 . . . 4 𝑥 ∈ V
2 vex 3331 . . . 4 𝑦 ∈ V
31, 2eqvinop 5091 . . 3 (𝐴 = ⟨𝑥, 𝑦⟩ ↔ ∃𝑧𝑤(𝐴 = ⟨𝑧, 𝑤⟩ ∧ ⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩))
4 19.8a 2187 . . . . . . . . 9 (∃𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) → ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑))
5419.23bi 2196 . . . . . . . 8 ((⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) → ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑))
65ex 449 . . . . . . 7 (⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ → (𝜑 → ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
7 vex 3331 . . . . . . . . 9 𝑧 ∈ V
8 vex 3331 . . . . . . . . 9 𝑤 ∈ V
97, 8opth 5081 . . . . . . . 8 (⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ↔ (𝑧 = 𝑥𝑤 = 𝑦))
109anbi1i 733 . . . . . . . . . 10 ((⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑))
11102exbii 1912 . . . . . . . . 9 (∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ∃𝑥𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑))
12 nfe1 2164 . . . . . . . . . . 11 𝑥𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))
13 19.8a 2187 . . . . . . . . . . . . . . . 16 ((𝑤 = 𝑦𝜑) → ∃𝑦(𝑤 = 𝑦𝜑))
1413anim2i 594 . . . . . . . . . . . . . . 15 ((𝑧 = 𝑥 ∧ (𝑤 = 𝑦𝜑)) → (𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
1514anassrs 683 . . . . . . . . . . . . . 14 (((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → (𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
1615eximi 1899 . . . . . . . . . . . . 13 (∃𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → ∃𝑦(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
17 biidd 252 . . . . . . . . . . . . . 14 (∀𝑦 𝑦 = 𝑥 → ((𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) ↔ (𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
1817drex1 2455 . . . . . . . . . . . . 13 (∀𝑦 𝑦 = 𝑥 → (∃𝑦(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) ↔ ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
1916, 18syl5ib 234 . . . . . . . . . . . 12 (∀𝑦 𝑦 = 𝑥 → (∃𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
20 anass 684 . . . . . . . . . . . . . . 15 (((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) ↔ (𝑧 = 𝑥 ∧ (𝑤 = 𝑦𝜑)))
2120exbii 1911 . . . . . . . . . . . . . 14 (∃𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) ↔ ∃𝑦(𝑧 = 𝑥 ∧ (𝑤 = 𝑦𝜑)))
22 19.40 1934 . . . . . . . . . . . . . . 15 (∃𝑦(𝑧 = 𝑥 ∧ (𝑤 = 𝑦𝜑)) → (∃𝑦 𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
23 nfeqf2 2430 . . . . . . . . . . . . . . . . 17 (¬ ∀𝑦 𝑦 = 𝑥 → Ⅎ𝑦 𝑧 = 𝑥)
242319.9d 2205 . . . . . . . . . . . . . . . 16 (¬ ∀𝑦 𝑦 = 𝑥 → (∃𝑦 𝑧 = 𝑥𝑧 = 𝑥))
2524anim1d 589 . . . . . . . . . . . . . . 15 (¬ ∀𝑦 𝑦 = 𝑥 → ((∃𝑦 𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) → (𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
2622, 25syl5 34 . . . . . . . . . . . . . 14 (¬ ∀𝑦 𝑦 = 𝑥 → (∃𝑦(𝑧 = 𝑥 ∧ (𝑤 = 𝑦𝜑)) → (𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
2721, 26syl5bi 232 . . . . . . . . . . . . 13 (¬ ∀𝑦 𝑦 = 𝑥 → (∃𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → (𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
28 19.8a 2187 . . . . . . . . . . . . 13 ((𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) → ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
2927, 28syl6 35 . . . . . . . . . . . 12 (¬ ∀𝑦 𝑦 = 𝑥 → (∃𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))))
3019, 29pm2.61i 176 . . . . . . . . . . 11 (∃𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
3112, 30exlimi 2221 . . . . . . . . . 10 (∃𝑥𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)))
32 euequ1 2601 . . . . . . . . . . . . . 14 ∃!𝑥 𝑥 = 𝑧
33 equcom 2088 . . . . . . . . . . . . . . 15 (𝑥 = 𝑧𝑧 = 𝑥)
3433eubii 2617 . . . . . . . . . . . . . 14 (∃!𝑥 𝑥 = 𝑧 ↔ ∃!𝑥 𝑧 = 𝑥)
3532, 34mpbi 220 . . . . . . . . . . . . 13 ∃!𝑥 𝑧 = 𝑥
36 eupick 2662 . . . . . . . . . . . . 13 ((∃!𝑥 𝑧 = 𝑥 ∧ ∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑))) → (𝑧 = 𝑥 → ∃𝑦(𝑤 = 𝑦𝜑)))
3735, 36mpan 708 . . . . . . . . . . . 12 (∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) → (𝑧 = 𝑥 → ∃𝑦(𝑤 = 𝑦𝜑)))
3837com12 32 . . . . . . . . . . 11 (𝑧 = 𝑥 → (∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) → ∃𝑦(𝑤 = 𝑦𝜑)))
39 euequ1 2601 . . . . . . . . . . . . . 14 ∃!𝑦 𝑦 = 𝑤
40 equcom 2088 . . . . . . . . . . . . . . 15 (𝑦 = 𝑤𝑤 = 𝑦)
4140eubii 2617 . . . . . . . . . . . . . 14 (∃!𝑦 𝑦 = 𝑤 ↔ ∃!𝑦 𝑤 = 𝑦)
4239, 41mpbi 220 . . . . . . . . . . . . 13 ∃!𝑦 𝑤 = 𝑦
43 eupick 2662 . . . . . . . . . . . . 13 ((∃!𝑦 𝑤 = 𝑦 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) → (𝑤 = 𝑦𝜑))
4442, 43mpan 708 . . . . . . . . . . . 12 (∃𝑦(𝑤 = 𝑦𝜑) → (𝑤 = 𝑦𝜑))
4544com12 32 . . . . . . . . . . 11 (𝑤 = 𝑦 → (∃𝑦(𝑤 = 𝑦𝜑) → 𝜑))
4638, 45sylan9 692 . . . . . . . . . 10 ((𝑧 = 𝑥𝑤 = 𝑦) → (∃𝑥(𝑧 = 𝑥 ∧ ∃𝑦(𝑤 = 𝑦𝜑)) → 𝜑))
4731, 46syl5 34 . . . . . . . . 9 ((𝑧 = 𝑥𝑤 = 𝑦) → (∃𝑥𝑦((𝑧 = 𝑥𝑤 = 𝑦) ∧ 𝜑) → 𝜑))
4811, 47syl5bi 232 . . . . . . . 8 ((𝑧 = 𝑥𝑤 = 𝑦) → (∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) → 𝜑))
499, 48sylbi 207 . . . . . . 7 (⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ → (∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑) → 𝜑))
506, 49impbid 202 . . . . . 6 (⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
51 eqeq1 2752 . . . . . . 7 (𝐴 = ⟨𝑧, 𝑤⟩ → (𝐴 = ⟨𝑥, 𝑦⟩ ↔ ⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩))
5251anbi1d 743 . . . . . . . . 9 (𝐴 = ⟨𝑧, 𝑤⟩ → ((𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ (⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
53522exbidv 1989 . . . . . . . 8 (𝐴 = ⟨𝑧, 𝑤⟩ → (∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
5453bibi2d 331 . . . . . . 7 (𝐴 = ⟨𝑧, 𝑤⟩ → ((𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)) ↔ (𝜑 ↔ ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑))))
5551, 54imbi12d 333 . . . . . 6 (𝐴 = ⟨𝑧, 𝑤⟩ → ((𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))) ↔ (⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))))
5650, 55mpbiri 248 . . . . 5 (𝐴 = ⟨𝑧, 𝑤⟩ → (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))))
5756adantr 472 . . . 4 ((𝐴 = ⟨𝑧, 𝑤⟩ ∧ ⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩) → (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))))
5857exlimivv 1997 . . 3 (∃𝑧𝑤(𝐴 = ⟨𝑧, 𝑤⟩ ∧ ⟨𝑧, 𝑤⟩ = ⟨𝑥, 𝑦⟩) → (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))))
593, 58sylbi 207 . 2 (𝐴 = ⟨𝑥, 𝑦⟩ → (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))))
6059pm2.43i 52 1 (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑 ↔ ∃𝑥𝑦(𝐴 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 383  ∀wal 1618   = wceq 1620  ∃wex 1841  ∃!weu 2595  ⟨cop 4315 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1859  ax-4 1874  ax-5 1976  ax-6 2042  ax-7 2078  ax-9 2136  ax-10 2156  ax-11 2171  ax-12 2184  ax-13 2379  ax-ext 2728  ax-sep 4921  ax-nul 4929  ax-pr 5043 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1623  df-ex 1842  df-nf 1847  df-sb 2035  df-eu 2599  df-mo 2600  df-clab 2735  df-cleq 2741  df-clel 2744  df-nfc 2879  df-rab 3047  df-v 3330  df-dif 3706  df-un 3708  df-in 3710  df-ss 3717  df-nul 4047  df-if 4219  df-sn 4310  df-pr 4312  df-op 4316 This theorem is referenced by:  copsex2t  5093  copsex2g  5094  mosubopt  5108  opabid  5120  brabgaf  29698
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