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Theorem funfvdm2 5560
Description: The value of a function. Definition of function value in [Enderton] p. 43. (Contributed by Jim Kingdon, 1-Jan-2019.)
Assertion
Ref Expression
funfvdm2  |-  ( ( Fun  F  /\  A  e.  dom  F )  -> 
( F `  A
)  =  U. {
y  |  A F y } )
Distinct variable groups:    y, A    y, F

Proof of Theorem funfvdm2
StepHypRef Expression
1 funfvdm 5559 . 2  |-  ( ( Fun  F  /\  A  e.  dom  F )  -> 
( F `  A
)  =  U. ( F " { A }
) )
2 imasng 4976 . . . 4  |-  ( A  e.  dom  F  -> 
( F " { A } )  =  {
y  |  A F y } )
32adantl 275 . . 3  |-  ( ( Fun  F  /\  A  e.  dom  F )  -> 
( F " { A } )  =  {
y  |  A F y } )
43unieqd 3807 . 2  |-  ( ( Fun  F  /\  A  e.  dom  F )  ->  U. ( F " { A } )  =  U. { y  |  A F y } )
51, 4eqtrd 2203 1  |-  ( ( Fun  F  /\  A  e.  dom  F )  -> 
( F `  A
)  =  U. {
y  |  A F y } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    = wceq 1348    e. wcel 2141   {cab 2156   {csn 3583   U.cuni 3796   class class class wbr 3989   dom cdm 4611   "cima 4614   Fun wfun 5192   ` cfv 5198
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-v 2732  df-sbc 2956  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-fv 5206
This theorem is referenced by:  funfvdm2f  5561
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