Theorem eqoprab2b 7439

Description: Equivalence of ordered pair abstraction subclass and biconditional. Compare eqopab2b 5508. Usage of this theorem is discouraged because it depends on ax-13 2377. Use the weaker eqoprab2bw 7438 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} ↔ ∀𝑥∀𝑦∀𝑧(𝜑 ↔ 𝜓))

Proof of Theorem eqoprab2b

Step	Hyp	Ref	Expression
1		ssoprab2b 7437	. . 3 ⊢ ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ↔ ∀𝑥∀𝑦∀𝑧(𝜑 → 𝜓))
2		ssoprab2b 7437	. . 3 ⊢ ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ↔ ∀𝑥∀𝑦∀𝑧(𝜓 → 𝜑))
3	1, 2	anbi12i 629	. 2 ⊢ (({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ∧ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ⊆ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑}) ↔ (∀𝑥∀𝑦∀𝑧(𝜑 → 𝜓) ∧ ∀𝑥∀𝑦∀𝑧(𝜓 → 𝜑)))
4		eqss 3951	. 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 ⊢ (∀𝑦∀𝑧(𝜑 ↔ 𝜓) ↔ (∀𝑦∀𝑧(𝜑 → 𝜓) ∧ ∀𝑦∀𝑧(𝜓 → 𝜑)))
6	5	albii 1821	. . 3 ⊢ (∀𝑥∀𝑦∀𝑧(𝜑 ↔ 𝜓) ↔ ∀𝑥(∀𝑦∀𝑧(𝜑 → 𝜓) ∧ ∀𝑦∀𝑧(𝜓 → 𝜑)))
7		19.26 1872	. . 3 ⊢ (∀𝑥(∀𝑦∀𝑧(𝜑 → 𝜓) ∧ ∀𝑦∀𝑧(𝜓 → 𝜑)) ↔ (∀𝑥∀𝑦∀𝑧(𝜑 → 𝜓) ∧ ∀𝑥∀𝑦∀𝑧(𝜓 → 𝜑)))
8	6, 7	bitri 275	. 2 ⊢ (∀𝑥∀𝑦∀𝑧(𝜑 ↔ 𝜓) ↔ (∀𝑥∀𝑦∀𝑧(𝜑 → 𝜓) ∧ ∀𝑥∀𝑦∀𝑧(𝜓 → 𝜑)))
9	3, 4, 8	3bitr4i 303	1 ⊢ ({⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} ↔ ∀𝑥∀𝑦∀𝑧(𝜑 ↔ 𝜓))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395  ∀wal 1540   = wceq 1542   ⊆ wss 3903  {coprab 7369

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 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-13 2377  ax-ext 2709  ax-sep 5243  ax-pr 5379

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ral 3053  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-oprab 7372

This theorem is referenced by:  oprabbi  38412