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Theorem fvconst 5708
Description: The value of a constant function. (Contributed by NM, 30-May-1999.)
Assertion
Ref Expression
fvconst  |-  ( ( F : A --> { B }  /\  C  e.  A
)  ->  ( F `  C )  =  B )

Proof of Theorem fvconst
StepHypRef Expression
1 ffvelrn 5663 . 2  |-  ( ( F : A --> { B }  /\  C  e.  A
)  ->  ( F `  C )  e.  { B } )
2 elsni 3664 . 2  |-  ( ( F `  C )  e.  { B }  ->  ( F `  C
)  =  B )
31, 2syl 15 1  |-  ( ( F : A --> { B }  /\  C  e.  A
)  ->  ( F `  C )  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    = wceq 1623    e. wcel 1684   {csn 3640   -->wf 5251   ` cfv 5255
This theorem is referenced by:  fvconst2g  5727  fconst2g  5728  fconstfv  5734  ipasslem9  21416  istopxc  25548
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-eu 2147  df-mo 2148  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-sbc 2992  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-uni 3828  df-br 4024  df-opab 4078  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-fv 5263
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