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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  11986  xrminadd  11988  xpsfval  13615  prdsval  14118  xpsval  14146  ring1  14305  xmetxp  15501  xmetxpbl  15502  txmetcnp  15512  hovera  15641  hoverb  15642  hoverlt1  15643  hovergt0  15644  ivthdich  15647  wkslem1  16444  wkslem2  16445  iswlk  16447  2wlklem  16500  isclwwlk  16518  clwwlkccatlem  16524  clwwlkccat  16525  clwwlkn2  16545  clwwlkext2edg  16546  umgr2cwwk2dif  16548  s2elclwwlknon2  16560  clwwlknonex2lem2  16562  clwwlknonex2  16563  eupthseg  16576  eupth2lem3fi  16600
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