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Theorem br1cnvres 38778
Description: Binary relation on the converse of a restriction. (Contributed by Peter Mazsa, 27-Jul-2019.)
Assertion
Ref Expression
br1cnvres (𝐵𝑉 → (𝐵(𝑅𝐴)𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))

Proof of Theorem br1cnvres
StepHypRef Expression
1 df-res 5661 . . . 4 (𝑅𝐴) = (𝑅 ∩ (𝐴 × V))
21cnveqi 5848 . . 3 (𝑅𝐴) = (𝑅 ∩ (𝐴 × V))
32breqi 5108 . 2 (𝐵(𝑅𝐴)𝐶𝐵(𝑅 ∩ (𝐴 × V))𝐶)
4 elex 3477 . . 3 (𝐵𝑉𝐵 ∈ V)
5 br1cnvinxp 38763 . . . . 5 (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ ((𝐵 ∈ V ∧ 𝐶𝐴) ∧ 𝐶𝑅𝐵))
6 anass 472 . . . . 5 (((𝐵 ∈ V ∧ 𝐶𝐴) ∧ 𝐶𝑅𝐵) ↔ (𝐵 ∈ V ∧ (𝐶𝐴𝐶𝑅𝐵)))
75, 6bitri 277 . . . 4 (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐵 ∈ V ∧ (𝐶𝐴𝐶𝑅𝐵)))
87baib 543 . . 3 (𝐵 ∈ V → (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))
94, 8syl 17 . 2 (𝐵𝑉 → (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))
103, 9bitrid 285 1 (𝐵𝑉 → (𝐵(𝑅𝐴)𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 399  wcel 2144  Vcvv 3456  cin 3905   class class class wbr 5102   × cxp 5647  ccnv 5648  cres 5651
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-ext 2736  ax-sep 5248  ax-pr 5392
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-sb 2093  df-clab 2743  df-cleq 2756  df-clel 2839  df-ral 3079  df-rex 3089  df-rab 3417  df-v 3458  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5103  df-opab 5165  df-xp 5655  df-rel 5656  df-cnv 5657  df-res 5661
This theorem is referenced by:  elec1cnvres  38779  coss1cnvres  39011
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