Theorem fniniseg2 5636

Description: Inverse point images under functions expressed as abstractions. (Contributed by Stefan O'Rear, 1-Feb-2015.)

Assertion

Ref	Expression
fniniseg2	|- ( F Fn A -> ( `' F " { B } ) = { x e. A | ( F ` x ) = B } )

Distinct variable groups:   x, A   x, F   x, B

Proof of Theorem fniniseg2

Step	Hyp	Ref	Expression
1		fncnvima2 5635	. 2 |- ( F Fn A -> ( `' F " { B } ) = { x e. A | ( F ` x ) e. { B } } )
2		funfvex 5530	. . . . 5 |- ( ( Fun F /\ x e. dom F ) -> ( F ` x ) e. _V )
3		elsng 3607	. . . . 5 |- ( ( F ` x ) e. _V -> ( ( F ` x ) e. { B } <-> ( F ` x ) = B ) )
4	2, 3	syl 14	. . . 4 |- ( ( Fun F /\ x e. dom F ) -> ( ( F ` x ) e. { B } <-> ( F ` x ) = B ) )
5	4	funfni 5314	. . 3 |- ( ( F Fn A /\ x e. A ) -> ( ( F ` x ) e. { B } <-> ( F ` x ) = B ) )
6	5	rabbidva 2725	. 2 |- ( F Fn A -> { x e. A | ( F ` x ) e. { B } } = { x e. A | ( F ` x ) = B } )
7	1, 6	eqtrd 2210	1 |- ( F Fn A -> ( `' F " { B } ) = { x e. A | ( F ` x ) = B } )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1353   e. wcel 2148   {crab 2459   _Vcvv 2737   {csn 3592   `'ccnv 4624   dom cdm 4625   "cima 4628   Fun wfun 5208   Fn wfn 5209   ` cfv 5214

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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4120  ax-pow 4173  ax-pr 4208

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2739  df-sbc 2963  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4003  df-opab 4064  df-id 4292  df-xp 4631  df-rel 4632  df-cnv 4633  df-co 4634  df-dm 4635  df-rn 4636  df-res 4637  df-ima 4638  df-iota 5176  df-fun 5216  df-fn 5217  df-fv 5222

This theorem is referenced by: (None)