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Theorem dffn2 5690
 Description: Any function is a mapping into . (Contributed by NM, 31-Oct-1995.) (Proof shortened by Andrew Salmon, 17-Sep-2011.)
Assertion
Ref Expression
dffn2

Proof of Theorem dffn2
StepHypRef Expression
1 ssv 3427 . . 3
21biantru 507 . 2
3 df-f 5548 . 2
42, 3bitr4i 255 1
 Colors of variables: wff setvar class Syntax hints:   wb 187   wa 370  cvv 3022   wss 3379   crn 4797   wfn 5539  wf 5540 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1663  ax-4 1676  ax-5 1752  ax-6 1798  ax-7 1843  ax-10 1891  ax-11 1896  ax-12 1909  ax-13 2063  ax-ext 2408 This theorem depends on definitions:  df-bi 188  df-an 372  df-tru 1440  df-ex 1658  df-nf 1662  df-sb 1791  df-clab 2415  df-cleq 2421  df-clel 2424  df-v 3024  df-in 3386  df-ss 3393  df-f 5548 This theorem is referenced by:  f1cnvcnv  5747  fcoconst  6019  fnressn  6035  fndifnfp  6052  1stcof  6779  2ndcof  6780  fnmpt2  6819  tposfn  6957  tz7.48lem  7113  seqomlem2  7123  mptelixpg  7514  r111  8198  smobeth  8962  inar1  9151  imasvscafn  15386  fucidcl  15813  fucsect  15820  curfcl  16060  curf2ndf  16075  dsmmbas2  19242  frlmsslsp  19296  frlmup1  19298  prdstopn  20585  prdstps  20586  ist0-4  20686  ptuncnv  20764  xpstopnlem2  20768  prdstgpd  21081  prdsxmslem2  21486  curry2ima  28235  fnchoice  37266  stoweidlem35  37779
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