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Theorem tpeq3d 3461
Description: Equality theorem for unordered triples. (Contributed by NM, 22-Jun-2014.)
Hypothesis
Ref Expression
tpeq1d.1  |-  ( ph  ->  A  =  B )
Assertion
Ref Expression
tpeq3d  |-  ( ph  ->  { C ,  D ,  A }  =  { C ,  D ,  B } )

Proof of Theorem tpeq3d
StepHypRef Expression
1 tpeq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 tpeq3 3458 . 2  |-  ( A  =  B  ->  { C ,  D ,  A }  =  { C ,  D ,  B } )
31, 2syl 14 1  |-  ( ph  ->  { C ,  D ,  A }  =  { C ,  D ,  B } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1243   {ctp 3377
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-v 2559  df-un 2922  df-sn 3381  df-tp 3383
This theorem is referenced by:  tpeq123d  3462
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