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Theorem fof 5615
Description: An onto mapping is a mapping. (Contributed by NM, 3-Aug-1994.)
Assertion
Ref Expression
fof  |-  ( F : A -onto-> B  ->  F : A --> B )

Proof of Theorem fof
StepHypRef Expression
1 eqimss 3302 . . 3  |-  ( ran 
F  =  B  ->  ran  F  C_  B )
21anim2i 342 . 2  |-  ( ( F  Fn  A  /\  ran  F  =  B )  ->  ( F  Fn  A  /\  ran  F  C_  B ) )
3 df-fo 5383 . 2  |-  ( F : A -onto-> B  <->  ( F  Fn  A  /\  ran  F  =  B ) )
4 df-f 5381 . 2  |-  ( F : A --> B  <->  ( F  Fn  A  /\  ran  F  C_  B ) )
52, 3, 43imtr4i 201 1  |-  ( F : A -onto-> B  ->  F : A --> B )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    = wceq 1402    C_ wss 3220   ran crn 4775    Fn wfn 5372   -->wf 5373   -onto->wfo 5375
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-in 3226  df-ss 3233  df-f 5381  df-fo 5383
This theorem is used by:  fofun  5616  fofn  5617  dffo2  5619  foima  5620  resdif  5661  ffoss  5672  fconstfvm  5933  cocan2  5994  foeqcnvco  5996  focdmex  6344  algrflem  6465  algrflemg  6466  tposf2  6539  mapfoss  6947  mapsn  6972  ssdomg  7065  fopwdom  7136  fidcenumlemrks  7270  fidcenumlemr  7272  ctmlemr  7448  ctm  7449  ctssdclemn0  7450  ctssdccl  7451  ctssdc  7453  enumctlemm  7454  enumct  7455  fodjuomnilemdc  7484  exmidfodomrlemr  7554  exmidfodomrlemrALT  7555  suplocexprlemdisj  8087  suplocexprlemub  8090  wrdsymb  11332  ennnfonelemdc  13290  ennnfonelemg  13294  ennnfonelemp1  13297  ennnfonelemhdmp1  13300  ennnfonelemkh  13303  ennnfonelemhf1o  13304  ennnfonelemex  13305  ennnfonelemhom  13306  ctinfomlemom  13318  ctinf  13321  ctiunctlemudc  13328  ctiunctlemf  13329  omctfn  13334  imasival  13627  imasbas  13628  imasplusg  13629  imasmulr  13630  imasaddfnlemg  13635  imasaddvallemg  13636  imasaddflemg  13637  imasmnd2  13759  imasgrp2  13913  mhmid  13918  mhmmnd  13919  mhmfmhm  13920  ghmgrp  13921  ghmfghm  14130  imasring  14369  znunit  14994  znrrg  14995  dvrecap  15814  gausslemma2dlem1f1o  16179  subctctexmid  17030  pw1nct  17033
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