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Theorem elpreima 5418
Description: Membership in the preimage of a set under a function. (Contributed by Jeff Madsen, 2-Sep-2009.)
Assertion
Ref Expression
elpreima  |-  ( F  Fn  A  ->  ( B  e.  ( `' F " C )  <->  ( B  e.  A  /\  ( F `  B )  e.  C ) ) )

Proof of Theorem elpreima
StepHypRef Expression
1 cnvimass 4795 . . . . 5  |-  ( `' F " C ) 
C_  dom  F
21sseli 3021 . . . 4  |-  ( B  e.  ( `' F " C )  ->  B  e.  dom  F )
3 fndm 5113 . . . . 5  |-  ( F  Fn  A  ->  dom  F  =  A )
43eleq2d 2157 . . . 4  |-  ( F  Fn  A  ->  ( B  e.  dom  F  <->  B  e.  A ) )
52, 4syl5ib 152 . . 3  |-  ( F  Fn  A  ->  ( B  e.  ( `' F " C )  ->  B  e.  A )
)
6 fnfun 5111 . . . . 5  |-  ( F  Fn  A  ->  Fun  F )
7 fvimacnvi 5413 . . . . 5  |-  ( ( Fun  F  /\  B  e.  ( `' F " C ) )  -> 
( F `  B
)  e.  C )
86, 7sylan 277 . . . 4  |-  ( ( F  Fn  A  /\  B  e.  ( `' F " C ) )  ->  ( F `  B )  e.  C
)
98ex 113 . . 3  |-  ( F  Fn  A  ->  ( B  e.  ( `' F " C )  -> 
( F `  B
)  e.  C ) )
105, 9jcad 301 . 2  |-  ( F  Fn  A  ->  ( B  e.  ( `' F " C )  -> 
( B  e.  A  /\  ( F `  B
)  e.  C ) ) )
11 fvimacnv 5414 . . . . 5  |-  ( ( Fun  F  /\  B  e.  dom  F )  -> 
( ( F `  B )  e.  C  <->  B  e.  ( `' F " C ) ) )
1211funfni 5114 . . . 4  |-  ( ( F  Fn  A  /\  B  e.  A )  ->  ( ( F `  B )  e.  C  <->  B  e.  ( `' F " C ) ) )
1312biimpd 142 . . 3  |-  ( ( F  Fn  A  /\  B  e.  A )  ->  ( ( F `  B )  e.  C  ->  B  e.  ( `' F " C ) ) )
1413expimpd 355 . 2  |-  ( F  Fn  A  ->  (
( B  e.  A  /\  ( F `  B
)  e.  C )  ->  B  e.  ( `' F " C ) ) )
1510, 14impbid 127 1  |-  ( F  Fn  A  ->  ( B  e.  ( `' F " C )  <->  ( B  e.  A  /\  ( F `  B )  e.  C ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102    <-> wb 103    e. wcel 1438   `'ccnv 4437   dom cdm 4438   "cima 4441   Fun wfun 5009    Fn wfn 5010   ` cfv 5015
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3957  ax-pow 4009  ax-pr 4036
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-eu 1951  df-mo 1952  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-v 2621  df-sbc 2841  df-un 3003  df-in 3005  df-ss 3012  df-pw 3431  df-sn 3452  df-pr 3453  df-op 3455  df-uni 3654  df-br 3846  df-opab 3900  df-id 4120  df-xp 4444  df-rel 4445  df-cnv 4446  df-co 4447  df-dm 4448  df-rn 4449  df-res 4450  df-ima 4451  df-iota 4980  df-fun 5017  df-fn 5018  df-fv 5023
This theorem is referenced by:  fniniseg  5419  fncnvima2  5420  rexsupp  5423  unpreima  5424  respreima  5427  fisumss  10784  tanvalap  10999
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