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Theorem f1dom 6926
Description: The domain of a one-to-one function is dominated by its codomain. (Contributed by NM, 19-Jun-1998.)
Hypothesis
Ref Expression
f1dom.1  |-  B  e. 
_V
Assertion
Ref Expression
f1dom  |-  ( F : A -1-1-> B  ->  A  ~<_  B )

Proof of Theorem f1dom
StepHypRef Expression
1 f1dom.1 . 2  |-  B  e. 
_V
2 f1domg 6924 . 2  |-  ( B  e.  _V  ->  ( F : A -1-1-> B  ->  A  ~<_  B ) )
31, 2ax-mp 8 1  |-  ( F : A -1-1-> B  ->  A  ~<_  B )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 1701   _Vcvv 2822   class class class wbr 4060   -1-1->wf1 5289    ~<_ cdom 6904
This theorem is referenced by:  dominf  8116  dominfac  8240  lgsqrlem4  20636
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1537  ax-5 1548  ax-17 1607  ax-9 1645  ax-8 1666  ax-13 1703  ax-14 1705  ax-6 1720  ax-7 1725  ax-11 1732  ax-12 1897  ax-ext 2297  ax-rep 4168  ax-sep 4178  ax-nul 4186  ax-pr 4251  ax-un 4549
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1533  df-nf 1536  df-sb 1640  df-eu 2180  df-mo 2181  df-clab 2303  df-cleq 2309  df-clel 2312  df-nfc 2441  df-ne 2481  df-ral 2582  df-rex 2583  df-reu 2584  df-rab 2586  df-v 2824  df-sbc 3026  df-csb 3116  df-dif 3189  df-un 3191  df-in 3193  df-ss 3200  df-nul 3490  df-if 3600  df-sn 3680  df-pr 3681  df-op 3683  df-uni 3865  df-iun 3944  df-br 4061  df-opab 4115  df-mpt 4116  df-id 4346  df-xp 4732  df-rel 4733  df-cnv 4734  df-co 4735  df-dm 4736  df-rn 4737  df-res 4738  df-ima 4739  df-iota 5256  df-fun 5294  df-fn 5295  df-f 5296  df-f1 5297  df-fo 5298  df-f1o 5299  df-fv 5300  df-dom 6908
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