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Theorem eqoprab2b 7214
 Description: Equivalence of ordered pair abstraction subclass and biconditional. Compare eqopab2b 5426. Usage of this theorem is discouraged because it depends on ax-13 2392. Use the weaker eqoprab2bw 7213 when possible. (Contributed by Mario Carneiro, 4-Jan-2017.) (New usage is discouraged.)
Assertion
Ref Expression
eqoprab2b ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ↔ ∀𝑥𝑦𝑧(𝜑𝜓))

Proof of Theorem eqoprab2b
StepHypRef Expression
1 ssoprab2b 7212 . . 3 ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ↔ ∀𝑥𝑦𝑧(𝜑𝜓))
2 ssoprab2b 7212 . . 3 ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ↔ ∀𝑥𝑦𝑧(𝜓𝜑))
31, 2anbi12i 629 . 2 (({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ∧ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}) ↔ (∀𝑥𝑦𝑧(𝜑𝜓) ∧ ∀𝑥𝑦𝑧(𝜓𝜑)))
4 eqss 3967 . 2 ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ↔ ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ∧ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}))
5 2albiim 1892 . . . 4 (∀𝑦𝑧(𝜑𝜓) ↔ (∀𝑦𝑧(𝜑𝜓) ∧ ∀𝑦𝑧(𝜓𝜑)))
65albii 1821 . . 3 (∀𝑥𝑦𝑧(𝜑𝜓) ↔ ∀𝑥(∀𝑦𝑧(𝜑𝜓) ∧ ∀𝑦𝑧(𝜓𝜑)))
7 19.26 1872 . . 3 (∀𝑥(∀𝑦𝑧(𝜑𝜓) ∧ ∀𝑦𝑧(𝜓𝜑)) ↔ (∀𝑥𝑦𝑧(𝜑𝜓) ∧ ∀𝑥𝑦𝑧(𝜓𝜑)))
86, 7bitri 278 . 2 (∀𝑥𝑦𝑧(𝜑𝜓) ↔ (∀𝑥𝑦𝑧(𝜑𝜓) ∧ ∀𝑥𝑦𝑧(𝜓𝜑)))
93, 4, 83bitr4i 306 1 ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ↔ ∀𝑥𝑦𝑧(𝜑𝜓))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399  ∀wal 1536   = wceq 1538   ⊆ wss 3919  {coprab 7146 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-13 2392  ax-ext 2796  ax-sep 5189  ax-nul 5196  ax-pr 5317 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ral 3138  df-v 3482  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-nul 4276  df-if 4450  df-sn 4550  df-pr 4552  df-op 4556  df-oprab 7149 This theorem is referenced by:  oprabbi  35509
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