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Theorem f1imaen 4509
Description: A one-to-one function's image under a subset of its domain is equinumerous to the subset.
Hypothesis
Ref Expression
f1imaen.1 |- C e. V
Assertion
Ref Expression
f1imaen |- ((F:A-1-1->B /\ C (_ A) -> (F"C) ~~ C)

Proof of Theorem f1imaen
StepHypRef Expression
1 f1ores 3779 . 2 |- ((F:A-1-1->B /\ C (_ A) -> (F |` C):C-1-1-onto->(F"C))
2 f1imaen.1 . . . 4 |- C e. V
32f1oen 4485 . . 3 |- ((F |` C):C-1-1-onto->(F"C) -> C ~~ (F"C))
4 f1ofo 3771 . . . 4 |- ((F |` C):C-1-1-onto->(F"C) -> (F |` C):C-onto->(F"C))
5 fornex 3755 . . . . 5 |- (C e. V -> ((F |` C):C-onto->(F"C) -> (F"C) e. V))
62, 5ax-mp 7 . . . 4 |- ((F |` C):C-onto->(F"C) -> (F"C) e. V)
7 ensymg 4498 . . . 4 |- ((F"C) e. V -> (C ~~ (F"C) -> (F"C) ~~ C))
84, 6, 73syl 20 . . 3 |- ((F |` C):C-1-1-onto->(F"C) -> (C ~~ (F"C) -> (F"C) ~~ C))
93, 8mpd 26 . 2 |- ((F |` C):C-1-1-onto->(F"C) -> (F"C) ~~ C)
101, 9syl 10 1 |- ((F:A-1-1->B /\ C (_ A) -> (F"C) ~~ C)
Colors of variables: wff set class
Syntax hints:   -> wi 3   /\ wa 221   e. wcel 990  Vcvv 1849   (_ wss 2091   class class class wbr 2669   |` cres 3227  "cima 3228  -1-1->wf1 3234  -onto->wfo 3235  -1-1-onto->wf1o 3236   ~~ cen 4451
This theorem is referenced by:  ssenen 4593
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 994  ax-gen 995  ax-8 996  ax-9 997  ax-10 998  ax-11 999  ax-12 1000  ax-13 1001  ax-14 1002  ax-17 1003  ax-4 1005  ax-5o 1007  ax-6o 1010  ax-9o 1155  ax-10o 1173  ax-16 1243  ax-11o 1251  ax-ext 1494  ax-rep 2744  ax-sep 2754  ax-pow 2794  ax-pr 2832  ax-un 2920
This theorem depends on definitions:  df-bi 145  df-or 222  df-an 223  df-3an 780  df-ex 1013  df-sb 1205  df-eu 1415  df-mo 1416  df-clab 1500  df-cleq 1505  df-clel 1508  df-ne 1624  df-rex 1688  df-v 1850  df-dif 2093  df-un 2094  df-in 2095  df-ss 2097  df-nul 2325  df-pw 2447  df-sn 2457  df-pr 2458  df-op 2461  df-uni 2552  df-br 2670  df-opab 2718  df-id 2889  df-xp 3239  df-rel 3240  df-cnv 3241  df-co 3242  df-dm 3243  df-rn 3244  df-res 3245  df-ima 3246  df-fun 3247  df-fn 3248  df-f 3249  df-f1 3250  df-fo 3251  df-f1o 3252  df-er 4345  df-en 4455
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