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Theorem funiun 5828
Description: A function is a union of singletons of ordered pairs indexed by its domain. (Contributed by AV, 18-Sep-2020.)
Assertion
Ref Expression
funiun  |-  ( Fun 
F  ->  F  =  U_ x  e.  dom  F { <. x ,  ( F `  x )
>. } )
Distinct variable group:    x, F

Proof of Theorem funiun
StepHypRef Expression
1 funfn 5356 . . 3  |-  ( Fun 
F  <->  F  Fn  dom  F )
2 dffn5im 5691 . . 3  |-  ( F  Fn  dom  F  ->  F  =  ( x  e.  dom  F  |->  ( F `
 x ) ) )
31, 2sylbi 121 . 2  |-  ( Fun 
F  ->  F  =  ( x  e.  dom  F 
|->  ( F `  x
) ) )
4 funfvex 5656 . . . 4  |-  ( ( Fun  F  /\  x  e.  dom  F )  -> 
( F `  x
)  e.  _V )
54ralrimiva 2605 . . 3  |-  ( Fun 
F  ->  A. x  e.  dom  F ( F `
 x )  e. 
_V )
6 dfmptg 5826 . . 3  |-  ( A. x  e.  dom  F ( F `  x )  e.  _V  ->  (
x  e.  dom  F  |->  ( F `  x
) )  =  U_ x  e.  dom  F { <. x ,  ( F `
 x ) >. } )
75, 6syl 14 . 2  |-  ( Fun 
F  ->  ( x  e.  dom  F  |->  ( F `
 x ) )  =  U_ x  e. 
dom  F { <. x ,  ( F `  x ) >. } )
83, 7eqtrd 2264 1  |-  ( Fun 
F  ->  F  =  U_ x  e.  dom  F { <. x ,  ( F `  x )
>. } )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1397    e. wcel 2202   A.wral 2510   _Vcvv 2802   {csn 3669   <.cop 3672   U_ciun 3970    |-> cmpt 4150   dom cdm 4725   Fun wfun 5320    Fn wfn 5321   ` cfv 5326
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-reu 2517  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334
This theorem is referenced by: (None)
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