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Theorem br1cnvres 39120
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 5660 . . . 4 (𝑅𝐴) = (𝑅 ∩ (𝐴 × V))
21cnveqi 5849 . . 3 (𝑅𝐴) = (𝑅 ∩ (𝐴 × V))
32breqi 5109 . 2 (𝐵(𝑅𝐴)𝐶𝐵(𝑅 ∩ (𝐴 × V))𝐶)
4 elex 3471 . . 3 (𝐵𝑉𝐵 ∈ V)
5 br1cnvinxp 39105 . . . . 5 (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ ((𝐵 ∈ V ∧ 𝐶𝐴) ∧ 𝐶𝑅𝐵))
6 anass 474 . . . . 5 (((𝐵 ∈ V ∧ 𝐶𝐴) ∧ 𝐶𝑅𝐵) ↔ (𝐵 ∈ V ∧ (𝐶𝐴𝐶𝑅𝐵)))
75, 6bitri 278 . . . 4 (𝐵(𝑅 ∩ (𝐴 × V))𝐶 ↔ (𝐵 ∈ V ∧ (𝐶𝐴𝐶𝑅𝐵)))
87baib 545 . . 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 401  wcel 2145  Vcvv 3450  cin 3898   class class class wbr 5103   × cxp 5646  ccnv 5647  cres 5650
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-sep 5249  ax-pr 5391
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 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-xp 5654  df-rel 5655  df-cnv 5656  df-res 5660
This theorem is used by:  elec1cnvres  39121  coss1cnvres  39353
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