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Theorem fiinfnf1o 11225
Description: There is no bijection between a finite set and an infinite set. By infnfi 7199 the theorem would also hold if "infinite" were expressed as  om  ~<_  B. (Contributed by Alexander van der Vekens, 25-Dec-2017.)
Assertion
Ref Expression
fiinfnf1o  |-  ( ( A  e.  Fin  /\  -.  B  e.  Fin )  ->  -.  E. f 
f : A -1-1-onto-> B )
Distinct variable groups:    A, f    B, f

Proof of Theorem fiinfnf1o
StepHypRef Expression
1 f1ofi 7257 . . . 4  |-  ( ( A  e.  Fin  /\  f : A -1-1-onto-> B )  ->  B  e.  Fin )
21ex 115 . . 3  |-  ( A  e.  Fin  ->  (
f : A -1-1-onto-> B  ->  B  e.  Fin )
)
32exlimdv 1872 . 2  |-  ( A  e.  Fin  ->  ( E. f  f : A
-1-1-onto-> B  ->  B  e.  Fin ) )
43con3dimp 644 1  |-  ( ( A  e.  Fin  /\  -.  B  e.  Fin )  ->  -.  E. f 
f : A -1-1-onto-> B )
Colors of variables:    wff set class
This proof depends on syntax axioms:   -. wn 3    -> wi 4    /\ wa 104   E.wex 1545    e. wcel 2209   -1-1-onto->wf1o 5376   Fincfn 7022
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  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 4246  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578
This proof 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 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-er 6807  df-en 7023  df-fin 7025
This theorem is used by: (None)
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