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Theorem preq12d 3781
Description: Equality deduction for unordered pairs. (Contributed by NM, 19-Oct-2012.)
Hypotheses
Ref Expression
preq1d.1 (𝜑𝐴 = 𝐵)
preq12d.2 (𝜑𝐶 = 𝐷)
Assertion
Ref Expression
preq12d (𝜑 → {𝐴, 𝐶} = {𝐵, 𝐷})

Proof of Theorem preq12d
StepHypRef Expression
1 preq1d.1 . 2 (𝜑𝐴 = 𝐵)
2 preq12d.2 . 2 (𝜑𝐶 = 𝐷)
3 preq12 3775 . 2 ((𝐴 = 𝐵𝐶 = 𝐷) → {𝐴, 𝐶} = {𝐵, 𝐷})
41, 2, 3syl2anc 411 1 (𝜑 → {𝐴, 𝐶} = {𝐵, 𝐷})
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  {cpr 3695
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-v 2817  df-un 3218  df-sn 3700  df-pr 3701
This theorem is referenced by:  opeq1  3888  opeq2  3889  xrminrecl  11987  xrminadd  11989  xpsfval  13616  prdsval  14119  xpsval  14147  ring1  14306  xmetxp  15502  xmetxpbl  15503  txmetcnp  15513  hovera  15642  hoverb  15643  hoverlt1  15644  hovergt0  15645  ivthdich  15648  wkslem1  16445  wkslem2  16446  iswlk  16448  2wlklem  16501  isclwwlk  16519  clwwlkccatlem  16525  clwwlkccat  16526  clwwlkn2  16546  clwwlkext2edg  16547  umgr2cwwk2dif  16549  s2elclwwlknon2  16561  clwwlknonex2lem2  16563  clwwlknonex2  16564  eupthseg  16577  eupth2lem3fi  16601
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