New Foundations Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  NFE Home  >  Th. List  >  feq23i Unicode version

Theorem feq23i 5219
 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 5213 . 2
41, 2, 3mp2an 653 1
 Colors of variables: wff setvar class Syntax hints:   wb 176   wceq 1642  wf 4777 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259  df-fn 4790  df-f 4791 This theorem is referenced by: (None)
 Copyright terms: Public domain W3C validator