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Theorem domen1 6839
Description: Equality-like theorem for equinumerosity and dominance. (Contributed by NM, 8-Nov-2003.)
Assertion
Ref Expression
domen1  |-  ( A 
~~  B  ->  ( A  ~<_  C  <->  B  ~<_  C ) )

Proof of Theorem domen1
StepHypRef Expression
1 ensym 6778 . . 3  |-  ( A 
~~  B  ->  B  ~~  A )
2 endomtr 6787 . . 3  |-  ( ( B  ~~  A  /\  A  ~<_  C )  ->  B  ~<_  C )
31, 2sylan 283 . 2  |-  ( ( A  ~~  B  /\  A  ~<_  C )  ->  B  ~<_  C )
4 endomtr 6787 . 2  |-  ( ( A  ~~  B  /\  B  ~<_  C )  ->  A  ~<_  C )
53, 4impbida 596 1  |-  ( A 
~~  B  ->  ( A  ~<_  C  <->  B  ~<_  C ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105   class class class wbr 4002    ~~ cen 6735    ~<_ cdom 6736
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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4120  ax-pow 4173  ax-pr 4208  ax-un 4432
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2739  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4003  df-opab 4064  df-id 4292  df-xp 4631  df-rel 4632  df-cnv 4633  df-co 4634  df-dm 4635  df-rn 4636  df-res 4637  df-ima 4638  df-fun 5217  df-fn 5218  df-f 5219  df-f1 5220  df-fo 5221  df-f1o 5222  df-er 6532  df-en 6738  df-dom 6739
This theorem is referenced by:  fihashdom  10776
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