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Theorem funfv2 5750
Description: The value of a function. Definition of function value in [Enderton] p. 43. (Contributed by NM, 22-May-1998.)
Assertion
Ref Expression
funfv2  |-  ( Fun 
F  ->  ( F `  A )  =  U. { y  |  A F y } )
Distinct variable groups:    y, A    y, F

Proof of Theorem funfv2
StepHypRef Expression
1 funfv 5749 . 2  |-  ( Fun 
F  ->  ( F `  A )  =  U. ( F " { A } ) )
2 funrel 5430 . . . 4  |-  ( Fun 
F  ->  Rel  F )
3 relimasn 5186 . . . 4  |-  ( Rel 
F  ->  ( F " { A } )  =  { y  |  A F y } )
42, 3syl 16 . . 3  |-  ( Fun 
F  ->  ( F " { A } )  =  { y  |  A F y } )
54unieqd 3986 . 2  |-  ( Fun 
F  ->  U. ( F " { A }
)  =  U. {
y  |  A F y } )
61, 5eqtrd 2436 1  |-  ( Fun 
F  ->  ( F `  A )  =  U. { y  |  A F y } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1649   {cab 2390   {csn 3774   U.cuni 3975   class class class wbr 4172   "cima 4840   Rel wrel 4842   Fun wfun 5407   ` cfv 5413
This theorem is referenced by:  funfv2f  5751
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-13 1723  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385  ax-sep 4290  ax-nul 4298  ax-pow 4337  ax-pr 4363
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2258  df-mo 2259  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-ne 2569  df-ral 2671  df-rex 2672  df-rab 2675  df-v 2918  df-sbc 3122  df-dif 3283  df-un 3285  df-in 3287  df-ss 3294  df-nul 3589  df-if 3700  df-sn 3780  df-pr 3781  df-op 3783  df-uni 3976  df-br 4173  df-opab 4227  df-id 4458  df-xp 4843  df-rel 4844  df-cnv 4845  df-co 4846  df-dm 4847  df-rn 4848  df-res 4849  df-ima 4850  df-iota 5377  df-fun 5415  df-fn 5416  df-fv 5421
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