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Theorem feq2i 5071
Description: Equality inference for functions. (Contributed by NM, 5-Sep-2011.)
Hypothesis
Ref Expression
feq2i.1  |-  A  =  B
Assertion
Ref Expression
feq2i  |-  ( F : A --> C  <->  F : B
--> C )

Proof of Theorem feq2i
StepHypRef Expression
1 feq2i.1 . 2  |-  A  =  B
2 feq2 5062 . 2  |-  ( A  =  B  ->  ( F : A --> C  <->  F : B
--> C ) )
31, 2ax-mp 7 1  |-  ( F : A --> C  <->  F : B
--> C )
Colors of variables: wff set class
Syntax hints:    <-> wb 103    = wceq 1285   -->wf 4928
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-5 1377  ax-gen 1379  ax-4 1441  ax-17 1460  ax-ext 2064
This theorem depends on definitions:  df-bi 115  df-cleq 2075  df-fn 4935  df-f 4936
This theorem is referenced by:  fmpt2x  5857  fmpt2  5858  tposf  5921  issmo  5937  tfrcllemsucfn  6002  1fv  9226  iseqfcl  9535
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