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Theorem bnj529 30811
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypothesis
Ref Expression
bnj529.1  |-  D  =  ( om  \  { (/)
} )
Assertion
Ref Expression
bnj529  |-  ( M  e.  D  ->  (/)  e.  M
)

Proof of Theorem bnj529
StepHypRef Expression
1 eldifsn 4317 . . . 4  |-  ( M  e.  ( om  \  { (/)
} )  <->  ( M  e.  om  /\  M  =/=  (/) ) )
21biimpi 206 . . 3  |-  ( M  e.  ( om  \  { (/)
} )  ->  ( M  e.  om  /\  M  =/=  (/) ) )
3 bnj529.1 . . 3  |-  D  =  ( om  \  { (/)
} )
42, 3eleq2s 2719 . 2  |-  ( M  e.  D  ->  ( M  e.  om  /\  M  =/=  (/) ) )
5 nnord 7073 . . 3  |-  ( M  e.  om  ->  Ord  M )
65anim1i 592 . 2  |-  ( ( M  e.  om  /\  M  =/=  (/) )  ->  ( Ord  M  /\  M  =/=  (/) ) )
7 ord0eln0 5779 . . 3  |-  ( Ord 
M  ->  ( (/)  e.  M  <->  M  =/=  (/) ) )
87biimpar 502 . 2  |-  ( ( Ord  M  /\  M  =/=  (/) )  ->  (/)  e.  M
)
94, 6, 83syl 18 1  |-  ( M  e.  D  ->  (/)  e.  M
)
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 384    = wceq 1483    e. wcel 1990    =/= wne 2794    \ cdif 3571   (/)c0 3915   {csn 4177   Ord word 5722   omcom 7065
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906  ax-un 6949
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-tr 4753  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-om 7066
This theorem is referenced by:  bnj545  30965  bnj900  30999  bnj929  31006
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