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Theorem cnveqb 6201
Description: Equality theorem for converse. (Contributed by FL, 19-Sep-2011.)
Assertion
Ref Expression
cnveqb ((Rel 𝐴 ∧ Rel 𝐵) → (𝐴 = 𝐵 ↔ ◡𝐴 = ◡𝐵))

Proof of Theorem cnveqb
StepHypRef Expression
1 cnvssb 6200 . . 3 (Rel 𝐴 → (𝐴 ⊆ 𝐵 ↔ ◡𝐴 ⊆ ◡𝐵))
2 cnvssb 6200 . . 3 (Rel 𝐵 → (𝐵 ⊆ 𝐴 ↔ ◡𝐵 ⊆ ◡𝐴))
31, 2bi2anan9 650 . 2 ((Rel 𝐴 ∧ Rel 𝐵) → ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴) ↔ (◡𝐴 ⊆ ◡𝐵 ∧ ◡𝐵 ⊆ ◡𝐴)))
4 eqss 3928 . 2 (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴))
5 eqss 3928 . 2 (◡𝐴 = ◡𝐵 ↔ (◡𝐴 ⊆ ◡𝐵 ∧ ◡𝐵 ⊆ ◡𝐴))
63, 4, 53bitr4g 317 1 ((Rel 𝐴 ∧ Rel 𝐵) → (𝐴 = 𝐵 ↔ ◡𝐴 = ◡𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   = wceq 1570   ⊆ wss 3900  ◡ccnv 5654  Rel wrel 5660
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5252  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5171  df-xp 5661  df-rel 5662  df-cnv 5663  df-res 5667
This theorem is used by:  cnveq0  6202  weisoeq2  7386  relexpaddg  15232  relexpaddss  44908
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