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Theorem cnveq 4899
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 4898 . . 3 (𝐴𝐵𝐴𝐵)
2 cnvss 4898 . . 3 (𝐵𝐴𝐵𝐴)
31, 2anim12i 338 . 2 ((𝐴𝐵𝐵𝐴) → (𝐴𝐵𝐵𝐴))
4 eqss 3239 . 2 (𝐴 = 𝐵 ↔ (𝐴𝐵𝐵𝐴))
5 eqss 3239 . 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 3197  ccnv 4719
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 3203  df-ss 3210  df-br 4084  df-opab 4146  df-cnv 4728
This theorem is referenced by:  cnveqi  4900  cnveqd  4901  rneq  4954  cnveqb  5187  funcnvuni  5393  f1eq1  5531  f1o00  5613  foeqcnvco  5923  tposfn2  6423  ereq1  6700  infeq3  7198  1arith  12911  isrim0  14146  psrbag  14654  psr1clfi  14673  iscn  14892  ishmeo  14999  istrl  16155
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