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Theorem coeq2d 4750
Description: Equality deduction for composition of two classes. (Contributed by NM, 16-Nov-2000.)
Hypothesis
Ref Expression
coeq1d.1  |-  ( ph  ->  A  =  B )
Assertion
Ref Expression
coeq2d  |-  ( ph  ->  ( C  o.  A
)  =  ( C  o.  B ) )

Proof of Theorem coeq2d
StepHypRef Expression
1 coeq1d.1 . 2  |-  ( ph  ->  A  =  B )
2 coeq2 4746 . 2  |-  ( A  =  B  ->  ( C  o.  A )  =  ( C  o.  B ) )
31, 2syl 14 1  |-  ( ph  ->  ( C  o.  A
)  =  ( C  o.  B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1335    o. ccom 4592
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 699  ax-5 1427  ax-7 1428  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-8 1484  ax-10 1485  ax-11 1486  ax-i12 1487  ax-bndl 1489  ax-4 1490  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2139
This theorem depends on definitions:  df-bi 116  df-nf 1441  df-sb 1743  df-clab 2144  df-cleq 2150  df-clel 2153  df-nfc 2288  df-in 3108  df-ss 3115  df-br 3968  df-opab 4028  df-co 4597
This theorem is referenced by:  coeq12d  4752  relcoi1  5119  f1ococnv1  5445  funcoeqres  5447  fcof1o  5741  foeqcnvco  5742  mapen  6793  hashfacen  10718
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