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Theorem uneq2i 3151
Description: Inference adding union to the left in a class equality. (Contributed by NM, 30-Aug-1993.)
Hypothesis
Ref Expression
uneq1i.1 𝐴 = 𝐵
Assertion
Ref Expression
uneq2i (𝐶𝐴) = (𝐶𝐵)

Proof of Theorem uneq2i
StepHypRef Expression
1 uneq1i.1 . 2 𝐴 = 𝐵
2 uneq2 3148 . 2 (𝐴 = 𝐵 → (𝐶𝐴) = (𝐶𝐵))
31, 2ax-mp 7 1 (𝐶𝐴) = (𝐶𝐵)
Colors of variables: wff set class
Syntax hints:   = wceq 1289  cun 2997
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-tru 1292  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-v 2621  df-un 3003
This theorem is referenced by:  un4  3160  unundir  3162  difun2  3362  difdifdirss  3367  qdass  3539  qdassr  3540  unisuc  4240  iunsuc  4247  fmptap  5487  fvsnun1  5494  rdgival  6147  rdg0  6152  undifdc  6632  exmidfodomrlemim  6825  facnn  10131  fac0  10132  fsum2dlemstep  10824  fsumiun  10867
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