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Theorem feq23i 5271
 Description: Equality inference for functions. (Contributed by Paul Chapman, 22-Jun-2011.)
Hypotheses
Ref Expression
feq23i.1
feq23i.2
Assertion
Ref Expression
feq23i

Proof of Theorem feq23i
StepHypRef Expression
1 feq23i.1 . 2
2 feq23i.2 . 2
3 feq23 5262 . 2
41, 2, 3mp2an 423 1
 Colors of variables: wff set class Syntax hints:   wb 104   wceq 1332  wf 5123 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-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-11 1485  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122 This theorem depends on definitions:  df-bi 116  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-in 3078  df-ss 3085  df-fn 5130  df-f 5131 This theorem is referenced by:  ftpg  5608
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