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Theorem cnvcnv3 5461
 Description: The set of all ordered pairs in a class is the same as the double converse. (Contributed by Mario Carneiro, 16-Aug-2015.)
Assertion
Ref Expression
cnvcnv3
Distinct variable group:   ,,

Proof of Theorem cnvcnv3
StepHypRef Expression
1 df-cnv 5012 . 2
2 vex 3112 . . . 4
3 vex 3112 . . . 4
42, 3brcnv 5190 . . 3
54opabbii 4516 . 2
61, 5eqtri 2486 1
 Colors of variables: wff setvar class Syntax hints:  =wceq 1395   class class class wbr 4452  {copab 4509  `'ccnv 5003 This theorem is referenced by:  dfrel4v  5463 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-9 1822  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435  ax-sep 4573  ax-nul 4581  ax-pr 4691 This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 975  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-eu 2286  df-mo 2287  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-ne 2654  df-rab 2816  df-v 3111  df-dif 3478  df-un 3480  df-in 3482  df-ss 3489  df-nul 3785  df-if 3942  df-sn 4030  df-pr 4032  df-op 4036  df-br 4453  df-opab 4511  df-cnv 5012
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