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Theorem br1cnvres 38951
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 5672 . . . 4 (𝑅𝐴) = (𝑅 ∩ (𝐴 × V))
21cnveqi 5859 . . 3 (𝑅𝐴) = (𝑅 ∩ (𝐴 × V))
32breqi 5114 . 2 (𝐵(𝑅𝐴)𝐶𝐵(𝑅 ∩ (𝐴 × V))𝐶)
4 elex 3475 . . 3 (𝐵𝑉𝐵 ∈ V)
5 br1cnvinxp 38936 . . . . 5 (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ ((𝐵 ∈ V ∧ 𝐶𝐴) ∧ 𝐶𝑅𝐵))
6 anass 473 . . . . 5 (((𝐵 ∈ V ∧ 𝐶𝐴) ∧ 𝐶𝑅𝐵) ↔ (𝐵 ∈ V ∧ (𝐶𝐴𝐶𝑅𝐵)))
75, 6bitri 278 . . . 4 (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐵 ∈ V ∧ (𝐶𝐴𝐶𝑅𝐵)))
87baib 544 . . 3 (𝐵 ∈ V → (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))
94, 8syl 18 . 2 (𝐵𝑉 → (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))
103, 9bitrid 286 1 (𝐵𝑉 → (𝐵(𝑅𝐴)𝐶 ↔ (𝐶𝐴𝐶𝑅𝐵)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wb 209  wa 400  wcel 2142  Vcvv 3454  cin 3903   class class class wbr 5108   × cxp 5658  ccnv 5659  cres 5662
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1824  ax-4 1838  ax-5 1939  ax-6 1996  ax-7 2037  ax-8 2144  ax-9 2152  ax-ext 2734  ax-sep 5256  ax-pr 5403
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1104  df-tru 1572  df-fal 1582  df-ex 1809  df-sb 2096  df-clab 2741  df-cleq 2754  df-clel 2837  df-ral 3079  df-rex 3089  df-rab 3416  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4487  df-sn 4589  df-pr 4591  df-op 4595  df-br 5109  df-opab 5173  df-xp 5666  df-rel 5667  df-cnv 5668  df-res 5672
This theorem is used by:  elec1cnvres  38952  coss1cnvres  39184
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