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Theorem fof 5269
 Description: An onto mapping is a mapping. (Contributed by set.mm contributors, 3-Aug-1994.)
Assertion
Ref Expression
fof

Proof of Theorem fof
StepHypRef Expression
1 eqimss 3323 . . 3
21anim2i 552 . 2
3 df-fo 4793 . 2
4 df-f 4791 . 2
52, 3, 43imtr4i 257 1
 Colors of variables: wff setvar class Syntax hints:   wi 4   wa 358   wceq 1642   wss 3257   crn 4773   wfn 4776  wf 4777  wfo 4779 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-f 4791  df-fo 4793 This theorem is referenced by:  fofun  5270  fofn  5271  dffo2  5273  foima  5274  resdif  5306  ffoss  5314  dffo4  5423  fconst5  5455  fconstfv  5456  mapsn  6026  xpassen  6057
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