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Theorem cnvi 4728
 Description: The converse of the identity relation. Theorem 3.7(ii) of [Monk1] p. 36. (Contributed by NM, 26-Apr-1998.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)
Assertion
Ref Expression
cnvi

Proof of Theorem cnvi
Dummy variables are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 vex 2560 . . . . 5
21ideq 4488 . . . 4
3 equcom 1593 . . . 4
42, 3bitri 173 . . 3
54opabbii 3824 . 2
6 df-cnv 4353 . 2
7 df-id 4030 . 2
85, 6, 73eqtr4i 2070 1
 Colors of variables: wff set class Syntax hints:   wceq 1243   class class class wbr 3764  copab 3817   cid 4025  ccnv 4344 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944 This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-br 3765  df-opab 3819  df-id 4030  df-xp 4351  df-rel 4352  df-cnv 4353 This theorem is referenced by:  coi2  4837  funi  4932  cnvresid  4973  fcoi1  5070  ssdomg  6258
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