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Theorem preq12d 3756
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 3750 . 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 1397  {cpr 3670
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-v 2804  df-un 3204  df-sn 3675  df-pr 3676
This theorem is referenced by:  opeq1  3862  opeq2  3863  xrminrecl  11835  xrminadd  11837  prdsval  13358  xpsfval  13433  xpsval  13437  ring1  14075  xmetxp  15234  xmetxpbl  15235  txmetcnp  15245  hovera  15374  hoverb  15375  hoverlt1  15376  hovergt0  15377  ivthdich  15380  wkslem1  16174  wkslem2  16175  iswlk  16177  2wlklem  16230  isclwwlk  16248  clwwlkccatlem  16254  clwwlkccat  16255  clwwlkn2  16275  clwwlkext2edg  16276  umgr2cwwk2dif  16278  s2elclwwlknon2  16290  clwwlknonex2lem2  16292  clwwlknonex2  16293  eupthseg  16306  eupth2lem3fi  16330
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