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Theorem f1imaeng 6942
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
StepHypRef Expression
1 f1ores 5586 . . 3  |-  ( ( F : A -1-1-> B  /\  C  C_  A )  ->  ( F  |`  C ) : C -1-1-onto-> ( F " C ) )
2 f1oeng 6906 . . . 4  |-  ( ( C  e.  V  /\  ( F  |`  C ) : C -1-1-onto-> ( F " C
) )  ->  C  ~~  ( F " C
) )
32ancoms 268 . . 3  |-  ( ( ( F  |`  C ) : C -1-1-onto-> ( F " C
)  /\  C  e.  V )  ->  C  ~~  ( F " C
) )
41, 3stoic3 1473 . 2  |-  ( ( F : A -1-1-> B  /\  C  C_  A  /\  C  e.  V )  ->  C  ~~  ( F
" C ) )
54ensymd 6933 1  |-  ( ( F : A -1-1-> B  /\  C  C_  A  /\  C  e.  V )  ->  ( F " C
)  ~~  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 1002    e. wcel 2200    C_ wss 3197   class class class wbr 4082    |` cres 4720   "cima 4721   -1-1->wf1 5314   -1-1-onto->wf1o 5316    ~~ cen 6883
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4198  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-un 4523
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-id 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325  df-er 6678  df-en 6886
This theorem is referenced by:  f1imaen  6944  isinfinf  7055  f1finf1o  7110  phimullem  12742
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