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Theorem coeq2d 4773
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 4769 . 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 1348    o. ccom 4615
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 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152
This theorem depends on definitions:  df-bi 116  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-in 3127  df-ss 3134  df-br 3990  df-opab 4051  df-co 4620
This theorem is referenced by:  coeq12d  4775  relcoi1  5142  f1ococnv1  5471  funcoeqres  5473  fcof1o  5768  foeqcnvco  5769  mapen  6824  hashfacen  10771
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