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Theorem brdomi 6920
Description: Dominance relation. (Contributed by Mario Carneiro, 26-Apr-2015.)
Assertion
Ref Expression
brdomi  |-  ( A  ~<_  B  ->  E. f 
f : A -1-1-> B
)
Distinct variable groups:    A, f    B, f

Proof of Theorem brdomi
StepHypRef Expression
1 reldom 6914 . . . 4  |-  Rel  ~<_
21brrelex2i 4770 . . 3  |-  ( A  ~<_  B  ->  B  e.  _V )
3 brdomg 6919 . . 3  |-  ( B  e.  _V  ->  ( A  ~<_  B  <->  E. f 
f : A -1-1-> B
) )
42, 3syl 14 . 2  |-  ( A  ~<_  B  ->  ( A  ~<_  B 
<->  E. f  f : A -1-1-> B ) )
54ibi 176 1  |-  ( A  ~<_  B  ->  E. f 
f : A -1-1-> B
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105   E.wex 1540    e. wcel 2202   _Vcvv 2802   class class class wbr 4088   -1-1->wf1 5323    ~<_ cdom 6908
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-xp 4731  df-rel 4732  df-cnv 4733  df-dm 4735  df-rn 4736  df-fn 5329  df-f 5330  df-f1 5331  df-dom 6911
This theorem is referenced by:  domssr  6951  2dom  6980  1dom1el  6993  xpdom2  7015  dom0  7024  isinfinf  7086  infm  7096  djudom  7292  difinfsn  7299  exmidfodomrlemim  7412  3dom  16590  domomsubct  16605
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