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Theorem cnveq 4902
Description: Equality theorem for converse. (Contributed by NM, 13-Aug-1995.)
Assertion
Ref Expression
cnveq (𝐴 = 𝐵𝐴 = 𝐵)

Proof of Theorem cnveq
StepHypRef Expression
1 cnvss 4901 . . 3 (𝐴𝐵𝐴𝐵)
2 cnvss 4901 . . 3 (𝐵𝐴𝐵𝐴)
31, 2anim12i 338 . 2 ((𝐴𝐵𝐵𝐴) → (𝐴𝐵𝐵𝐴))
4 eqss 3240 . 2 (𝐴 = 𝐵 ↔ (𝐴𝐵𝐵𝐴))
5 eqss 3240 . 2 (𝐴 = 𝐵 ↔ (𝐴𝐵𝐵𝐴))
63, 4, 53imtr4i 201 1 (𝐴 = 𝐵𝐴 = 𝐵)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1395  wss 3198  ccnv 4722
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211
This theorem depends on definitions:  df-bi 117  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-in 3204  df-ss 3211  df-br 4087  df-opab 4149  df-cnv 4731
This theorem is referenced by:  cnveqi  4903  cnveqd  4904  rneq  4957  cnveqb  5190  funcnvuni  5396  f1eq1  5534  f1o00  5616  foeqcnvco  5926  tposfn2  6427  ereq1  6704  infeq3  7205  1arith  12930  isrim0  14165  psrbag  14673  psr1clfi  14692  iscn  14911  ishmeo  15018  istrl  16180
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