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Theorem f1oeng 4385
Description: The domain and range of a one-to-one, onto function are equinumerous.
Assertion
Ref Expression
f1oeng |- ((A e. C /\ F:A-1-1-onto->B) -> A ~~ B)

Proof of Theorem f1oeng
StepHypRef Expression
1 fnex 3603 . . . 4 |- ((F Fn A /\ A e. C) -> F e. V)
21ancoms 436 . . 3 |- ((A e. C /\ F Fn A) -> F e. V)
3 f1ofn 3685 . . 3 |- (F:A-1-1-onto->B -> F Fn A)
42, 3sylan2 451 . 2 |- ((A e. C /\ F:A-1-1-onto->B) -> F e. V)
5 f1oen2g 4384 . 2 |- ((F e. V /\ F:A-1-1-onto->B) -> A ~~ B)
64, 5sylancom 475 1 |- ((A e. C /\ F:A-1-1-onto->B) -> A ~~ B)
Colors of variables: wff set class
Syntax hints:   -> wi 3   /\ wa 223   e. wcel 957  Vcvv 1808   class class class wbr 2615   Fn wfn 3173  -1-1-onto->wf1o 3177   ~~ cen 4357
This theorem is referenced by:  f1oen 4388  en2d 4390  unbenlem 7464
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 961  ax-gen 962  ax-8 963  ax-9 964  ax-10 965  ax-11 966  ax-12 967  ax-13 968  ax-14 969  ax-17 970  ax-4 972  ax-5o 974  ax-6o 977  ax-9o 1122  ax-10o 1139  ax-16 1209  ax-11o 1217  ax-ext 1458  ax-rep 2689  ax-sep 2699  ax-pow 2738  ax-pr 2775  ax-un 2862
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 980  df-sb 1171  df-eu 1381  df-mo 1382  df-clab 1463  df-cleq 1468  df-clel 1471  df-ne 1585  df-rex 1648  df-v 1809  df-dif 2046  df-un 2047  df-in 2048  df-ss 2050  df-nul 2278  df-pw 2399  df-sn 2409  df-pr 2410  df-op 2413  df-uni 2500  df-br 2616  df-opab 2663  df-id 2831  df-xp 3180  df-rel 3181  df-cnv 3182  df-co 3183  df-dm 3184  df-rn 3185  df-res 3186  df-ima 3187  df-fun 3188  df-fn 3189  df-f 3190  df-f1 3191  df-fo 3192  df-f1o 3193  df-en 4360
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