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Theorem uneq1d 3382
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 3376 . 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
This proof depends on syntax axioms:    -> wi 4    = wceq 1402    u. cun 3218
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
This theorem is used by:  ifeq1  3643  preq1  3788  tpeq1  3797  tpeq2  3798  resasplitss  5569  fmptpr  5907  funresdfunsnss  5918  rdgisucinc  6656  oasuc  6737  omsuc  6745  funresdfunsndc  6779  fisseneq  7242  sbthlemi5  7278  exmidfodomrlemim  7554  fzpred  10488  fseq1p1m1  10512  nn0split  10554  nnsplit  10555  fzo0sn0fzo1  10650  fzosplitpr  10663  fzosplitprm1  10664  zsupcllemstep  10673  hashfibclem  11298  fsum1p  12204  fprod1p  12385  setsvala  13435  setsabsd  13443  setscom  13444  prdsex  14256  prdsval  14257  psrmulrg  15158  plyaddlem1  15939  plymullem1  15940  birthdaylem2  16187
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