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Theorem opelcnvg 2517
Description: Ordered-pair membership in converse.
Assertion
Ref Expression
opelcnvg ((ACBD) → (⟨A, B⟩ ∈ R ↔ ⟨B, A⟩ ∈ R))

Proof of Theorem opelcnvg
StepHypRef Expression
1 breq2 2066 . . . 4 (x = A → (yRxyRA))
2 breq1 2065 . . . 4 (y = B → (yRABRA))
31, 2opelopabg 2115 . . 3 ((ACBD) → (⟨A, B⟩ ∈ {⟨x, y⟩∣yRx} ↔ BRA))
4 df-cnv 2426 . . . 4 R = {⟨x, y⟩∣yRx}
54eleq2i 1153 . . 3 (⟨A, B⟩ ∈ R ↔ ⟨A, B⟩ ∈ {⟨x, y⟩∣yRx})
63, 5syl5bb 410 . 2 ((ACBD) → (⟨A, B⟩ ∈ RBRA))
7 df-br 2063 . 2 (BRA ↔ ⟨B, A⟩ ∈ R)
86, 7syl6bb 414 1 ((ACBD) → (⟨A, B⟩ ∈ R ↔ ⟨B, A⟩ ∈ R))
Colors of variables: wff set class
Syntax hints:   → wi 2   ↔ wb 127   ∧ wa 196   ∈ wcel 1092  ⟨cop 1810   class class class wbr 2054  {copab 2055  ccnv 2409
This theorem is referenced by:  opelcnv 2518  leltt 4278
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-br 2063  df-opab 2098  df-cnv 2426
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