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Theorem sbcopeq1a 7165
 Description: Equality theorem for substitution of a class for an ordered pair (analog of sbceq1a 3428 that avoids the existential quantifiers of copsexg 4916). (Contributed by NM, 19-Aug-2006.) (Revised by Mario Carneiro, 31-Aug-2015.)
Assertion
Ref Expression
sbcopeq1a (𝐴 = ⟨𝑥, 𝑦⟩ → ([(1st𝐴) / 𝑥][(2nd𝐴) / 𝑦]𝜑𝜑))

Proof of Theorem sbcopeq1a
StepHypRef Expression
1 vex 3189 . . . . 5 𝑥 ∈ V
2 vex 3189 . . . . 5 𝑦 ∈ V
31, 2op2ndd 7124 . . . 4 (𝐴 = ⟨𝑥, 𝑦⟩ → (2nd𝐴) = 𝑦)
43eqcomd 2627 . . 3 (𝐴 = ⟨𝑥, 𝑦⟩ → 𝑦 = (2nd𝐴))
5 sbceq1a 3428 . . 3 (𝑦 = (2nd𝐴) → (𝜑[(2nd𝐴) / 𝑦]𝜑))
64, 5syl 17 . 2 (𝐴 = ⟨𝑥, 𝑦⟩ → (𝜑[(2nd𝐴) / 𝑦]𝜑))
71, 2op1std 7123 . . . 4 (𝐴 = ⟨𝑥, 𝑦⟩ → (1st𝐴) = 𝑥)
87eqcomd 2627 . . 3 (𝐴 = ⟨𝑥, 𝑦⟩ → 𝑥 = (1st𝐴))
9 sbceq1a 3428 . . 3 (𝑥 = (1st𝐴) → ([(2nd𝐴) / 𝑦]𝜑[(1st𝐴) / 𝑥][(2nd𝐴) / 𝑦]𝜑))
108, 9syl 17 . 2 (𝐴 = ⟨𝑥, 𝑦⟩ → ([(2nd𝐴) / 𝑦]𝜑[(1st𝐴) / 𝑥][(2nd𝐴) / 𝑦]𝜑))
116, 10bitr2d 269 1 (𝐴 = ⟨𝑥, 𝑦⟩ → ([(1st𝐴) / 𝑥][(2nd𝐴) / 𝑦]𝜑𝜑))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   = wceq 1480  [wsbc 3417  ⟨cop 4154  ‘cfv 5847  1st c1st 7111  2nd c2nd 7112 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3188  df-sbc 3418  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-nul 3892  df-if 4059  df-sn 4149  df-pr 4151  df-op 4155  df-uni 4403  df-br 4614  df-opab 4674  df-mpt 4675  df-id 4989  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-iota 5810  df-fun 5849  df-fv 5855  df-1st 7113  df-2nd 7114 This theorem is referenced by:  dfopab2  7167  dfoprab3s  7168
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