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Theorem fvconst 5696
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 ffvelcdm 5641 . 2  |-  ( ( F : A --> { B }  /\  C  e.  A
)  ->  ( F `  C )  e.  { B } )
2 elsni 3607 . 2  |-  ( ( F `  C )  e.  { B }  ->  ( F `  C
)  =  B )
31, 2syl 14 1  |-  ( ( F : A --> { B }  /\  C  e.  A
)  ->  ( F `  C )  =  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1353    e. wcel 2146   {csn 3589   -->wf 5204   ` cfv 5208
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-pow 4169  ax-pr 4203
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1459  df-sb 1761  df-eu 2027  df-mo 2028  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ral 2458  df-rex 2459  df-v 2737  df-sbc 2961  df-un 3131  df-in 3133  df-ss 3140  df-pw 3574  df-sn 3595  df-pr 3596  df-op 3598  df-uni 3806  df-br 3999  df-opab 4060  df-id 4287  df-xp 4626  df-rel 4627  df-cnv 4628  df-co 4629  df-dm 4630  df-rn 4631  df-iota 5170  df-fun 5210  df-fn 5211  df-f 5212  df-fv 5216
This theorem is referenced by:  fvconst2g  5722  fconst2g  5723  fconstfvm  5726
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