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Theorem fvmptelcdm 5861
Description: The value of a function at a point of its domain belongs to its codomain. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
Hypothesis
Ref Expression
fvmptelcdm.1  |-  ( ph  ->  ( x  e.  A  |->  B ) : A --> C )
Assertion
Ref Expression
fvmptelcdm  |-  ( (
ph  /\  x  e.  A )  ->  B  e.  C )
Distinct variable groups:    x, A    x, C
Allowed substitution hints:    ph( x)    B( x)

Proof of Theorem fvmptelcdm
StepHypRef Expression
1 fvmptelcdm.1 . . 3  |-  ( ph  ->  ( x  e.  A  |->  B ) : A --> C )
2 eqid 2238 . . . 4  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  B )
32fmpt 5858 . . 3  |-  ( A. x  e.  A  B  e.  C  <->  ( x  e.  A  |->  B ) : A --> C )
41, 3sylibr 134 . 2  |-  ( ph  ->  A. x  e.  A  B  e.  C )
54r19.21bi 2638 1  |-  ( (
ph  /\  x  e.  A )  ->  B  e.  C )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    e. wcel 2209   A.wral 2528    |-> cmpt 4192   -->wf 5373
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-fv 5385
This theorem is used by:  txcnp  15372  cnmpt1t  15386  cnmpt12  15388  divcncfap  15715  maxcncf  15716  mincncf  15717  dvmptclx  15819
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