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Theorem f1imaeng 7009
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 5607 . . 3  |-  ( ( F : A -1-1-> B  /\  C  C_  A )  ->  ( F  |`  C ) : C -1-1-onto-> ( F " C ) )
2 f1oeng 6973 . . . 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 1476 . 2  |-  ( ( F : A -1-1-> B  /\  C  C_  A  /\  C  e.  V )  ->  C  ~~  ( F
" C ) )
54ensymd 7000 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 1005    e. wcel 2202    C_ wss 3201   class class class wbr 4093    |` cres 4733   "cima 4734   -1-1->wf1 5330   -1-1-onto->wf1o 5332    ~~ cen 6950
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4209  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-reu 2518  df-rab 2520  df-v 2805  df-sbc 3033  df-csb 3129  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-iun 3977  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-f1o 5340  df-fv 5341  df-er 6745  df-en 6953
This theorem is referenced by:  f1imaen  7011  isinfinf  7129  imaf1fi  7168  f1finf1o  7189  phimullem  12860
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