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Theorem ordge1n0 6734
Description: An ordinal greater than or equal to 1 is nonzero. (Contributed by NM, 21-Dec-2004.)
Assertion
Ref Expression
ordge1n0  |-  ( Ord 
A  ->  ( 1o  C_  A  <->  A  =/=  (/) ) )

Proof of Theorem ordge1n0
StepHypRef Expression
1 ordgt0ge1 6733 . 2  |-  ( Ord 
A  ->  ( (/)  e.  A  <->  1o  C_  A ) )
2 ord0eln0 4627 . 2  |-  ( Ord 
A  ->  ( (/)  e.  A  <->  A  =/=  (/) ) )
31, 2bitr3d 247 1  |-  ( Ord 
A  ->  ( 1o  C_  A  <->  A  =/=  (/) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    e. wcel 1725    =/= wne 2598    C_ wss 3312   (/)c0 3620   Ord word 4572   1oc1o 6709
This theorem is referenced by:  om00  6810
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-sep 4322  ax-nul 4330  ax-pr 4395  ax-un 4693
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-ral 2702  df-rex 2703  df-rab 2706  df-v 2950  df-sbc 3154  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-pss 3328  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-tp 3814  df-op 3815  df-uni 4008  df-br 4205  df-opab 4259  df-tr 4295  df-eprel 4486  df-po 4495  df-so 4496  df-fr 4533  df-we 4535  df-ord 4576  df-on 4577  df-suc 4579  df-1o 6716
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