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Theorem uneq1d 3376
Description: Deduction adding union to the right in a class equality. (Contributed by NM, 29-Mar-1998.)
Hypothesis
Ref Expression
uneq1d.1  |-  ( ph  ->  A  =  B )
Assertion
Ref Expression
uneq1d  |-  ( ph  ->  ( A  u.  C
)  =  ( B  u.  C ) )

Proof of Theorem uneq1d
StepHypRef Expression
1 uneq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 uneq1 3370 . 2  |-  ( A  =  B  ->  ( A  u.  C )  =  ( B  u.  C ) )
31, 2syl 14 1  |-  ( ph  ->  ( A  u.  C
)  =  ( B  u.  C ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1398    u. cun 3212
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
This theorem is referenced by:  ifeq1  3629  preq1  3773  tpeq1  3782  tpeq2  3783  resasplitss  5549  fmptpr  5881  funresdfunsnss  5892  rdgisucinc  6629  oasuc  6710  omsuc  6718  funresdfunsndc  6752  fisseneq  7208  sbthlemi5  7244  exmidfodomrlemim  7517  fzpred  10429  fseq1p1m1  10453  nn0split  10495  nnsplit  10496  fzo0sn0fzo1  10591  fzosplitpr  10604  fzosplitprm1  10605  zsupcllemstep  10614  hashfibclem  11234  fsum1p  12132  fprod1p  12313  setsvala  13330  setsabsd  13338  setscom  13339  prdsex  14117  prdsval  14118  plyaddlem1  15741  plymullem1  15742
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