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Theorem preq12d 3796
Description: Equality deduction for unordered pairs. (Contributed by NM, 19-Oct-2012.)
Hypotheses
Ref Expression
preq1d.1  |-  ( ph  ->  A  =  B )
preq12d.2  |-  ( ph  ->  C  =  D )
Assertion
Ref Expression
preq12d  |-  ( ph  ->  { A ,  C }  =  { B ,  D } )

Proof of Theorem preq12d
StepHypRef Expression
1 preq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 preq12d.2 . 2  |-  ( ph  ->  C  =  D )
3 preq12 3790 . 2  |-  ( ( A  =  B  /\  C  =  D )  ->  { A ,  C }  =  { B ,  D } )
41, 2, 3syl2anc 415 1  |-  ( ph  ->  { A ,  C }  =  { B ,  D } )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    = wceq 1402   {cpr 3710
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-un 3224  df-sn 3715  df-pr 3716
This theorem is used by:  opeq1  3904  opeq2  3905  xrminrecl  12058  xrminadd  12060  xpsfval  13722  prdsval  14257  xpsval  14285  ring1  14448  xmetxp  15699  xmetxpbl  15700  txmetcnp  15710  hovera  15839  hoverb  15840  hoverlt1  15841  hovergt0  15842  ivthdich  15845  wkslem1  16727  wkslem2  16728  iswlk  16730  2wlklem  16783  isclwwlk  16801  clwwlkccatlem  16807  clwwlkccat  16808  clwwlkn2  16828  clwwlkext2edg  16829  umgr2cwwk2dif  16831  s2elclwwlknon2  16843  clwwlknonex2lem2  16845  clwwlknonex2  16846  eupthseg  16859  eupth2lem3fi  16883
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