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Theorem uneq2i 3222
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  |-  ( C  u.  A )  =  ( C  u.  B
)

Proof of Theorem uneq2i
StepHypRef Expression
1 uneq1i.1 . 2  |-  A  =  B
2 uneq2 3219 . 2  |-  ( A  =  B  ->  ( C  u.  A )  =  ( C  u.  B ) )
31, 2ax-mp 5 1  |-  ( C  u.  A )  =  ( C  u.  B
)
Colors of variables: wff set class
Syntax hints:    = wceq 1331    u. cun 3064
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119
This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-v 2683  df-un 3070
This theorem is referenced by:  un4  3231  unundir  3233  difun2  3437  difdifdirss  3442  qdass  3615  qdassr  3616  unisuc  4330  iunsuc  4337  fmptap  5603  fvsnun1  5610  rdgival  6272  rdg0  6277  undifdc  6805  exmidfodomrlemim  7050  djuassen  7066  facnn  10466  fac0  10467  fsum2dlemstep  11196  fsumiun  11239
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