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Theorem fnop 5347
Description: The first argument of an ordered pair in a function belongs to the function's domain. (Contributed by NM, 8-Aug-1994.)
Assertion
Ref Expression
fnop  |-  ( ( F  Fn  A  /\  <. B ,  C >.  e.  F )  ->  B  e.  A )

Proof of Theorem fnop
StepHypRef Expression
1 df-br 4024 . 2  |-  ( B F C  <->  <. B ,  C >.  e.  F )
2 fnbr 5346 . 2  |-  ( ( F  Fn  A  /\  B F C )  ->  B  e.  A )
31, 2sylan2br 462 1  |-  ( ( F  Fn  A  /\  <. B ,  C >.  e.  F )  ->  B  e.  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    e. wcel 1684   <.cop 3643   class class class wbr 4023    Fn wfn 5250
This theorem is referenced by:  2elresin  5355  tfrlem2  6392  tfrlem9  6401  wfrlem12  24267  frrlem11  24293
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pr 4214
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-sn 3646  df-pr 3647  df-op 3649  df-br 4024  df-opab 4078  df-xp 4695  df-rel 4696  df-dm 4699  df-fun 5257  df-fn 5258
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