Theorem f1imaeng 7069

Description: A one-to-one function's image under a subset of its domain is equinumerous to the subset. (Contributed by Mario Carneiro, 15-May-2015.)

Assertion

Ref	Expression
f1imaeng	|- ( ( F : A -1-1-> B /\ C C_ A /\ C e. V ) -> ( F " C ) ~~ C )

Proof of Theorem f1imaeng

Step	Hyp	Ref	Expression
1		f1ores 5649	. . 3 |- ( ( F : A -1-1-> B /\ C C_ A ) -> ( F |` C ) : C -1-1-onto-> ( F " C ) )
2		f1oeng 7033	. . . 4 |- ( ( C e. V /\ ( F |` C ) : C -1-1-onto-> ( F " C ) ) -> C ~~ ( F " C ) )
3	2	ancoms 268	. . 3 |- ( ( ( F |` C ) : C -1-1-onto-> ( F " C ) /\ C e. V ) -> C ~~ ( F " C ) )
4	1, 3	stoic3 1480	. 2 |- ( ( F : A -1-1-> B /\ C C_ A /\ C e. V ) -> C ~~ ( F " C ) )
5	4	ensymd 7060	1 |- ( ( F : A -1-1-> B /\ C C_ A /\ C e. V ) -> ( F " C ) ~~ C )

Syntax hints:   -> wi 4   /\ w3a 1009   e. wcel 2209   C_ wss 3220   class class class wbr 4125   |` cres 4771   "cima 4772   -1-1->wf1 5369   -1-1-onto->wf1o 5371   ~~ cen 7010

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-er 6797  df-en 7013

This theorem is referenced by:  f1imaen  7071  isinfinf  7191  imaf1fi  7230  f1finf1o  7254  fsuppcorn  7291  phimullem  12981  ballotfilemro  13244