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Theorem funfvima2 5954
Description: A function's value in an included preimage belongs to the image. (Contributed by NM, 3-Feb-1997.)
Assertion
Ref Expression
funfvima2  |-  ( ( Fun  F  /\  A  C_ 
dom  F )  -> 
( B  e.  A  ->  ( F `  B
)  e.  ( F
" A ) ) )

Proof of Theorem funfvima2
StepHypRef Expression
1 ssel 3242 . . 3  |-  ( A 
C_  dom  F  ->  ( B  e.  A  ->  B  e.  dom  F ) )
2 funfvima 5953 . . . . . 6  |-  ( ( Fun  F  /\  B  e.  dom  F )  -> 
( B  e.  A  ->  ( F `  B
)  e.  ( F
" A ) ) )
32ex 115 . . . . 5  |-  ( Fun 
F  ->  ( B  e.  dom  F  ->  ( B  e.  A  ->  ( F `  B )  e.  ( F " A ) ) ) )
43com23 78 . . . 4  |-  ( Fun 
F  ->  ( B  e.  A  ->  ( B  e.  dom  F  -> 
( F `  B
)  e.  ( F
" A ) ) ) )
54a2d 26 . . 3  |-  ( Fun 
F  ->  ( ( B  e.  A  ->  B  e.  dom  F )  ->  ( B  e.  A  ->  ( F `  B )  e.  ( F " A ) ) ) )
61, 5syl5 32 . 2  |-  ( Fun 
F  ->  ( A  C_ 
dom  F  ->  ( B  e.  A  ->  ( F `  B )  e.  ( F " A
) ) ) )
76imp 124 1  |-  ( ( Fun  F  /\  A  C_ 
dom  F )  -> 
( B  e.  A  ->  ( F `  B
)  e.  ( F
" A ) ) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    e. wcel 2209    C_ wss 3220   dom cdm 4776   "cima 4779   Fun wfun 5374   ` cfv 5380
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 4251  ax-pow 4313  ax-pr 4348
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-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 4132  df-opab 4194  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-fv 5388
This theorem is used by:  fnfvima  5956  resfvresima  5959  funimass4f  6363  phimullem  13032  qtopbasss  15747  tgqioo  15781  plyaddlem1  15973  plymullem1  15974
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