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Theorem onsseleq 2989
Description: Relationship between subset and membership of an ordinal number.
Assertion
Ref Expression
onsseleq |- ((A e. On /\ B e. On) -> (A (_ B <-> (A e. B \/ A = B)))

Proof of Theorem onsseleq
StepHypRef Expression
1 ordsseleq 2966 . 2 |- ((Ord A /\ Ord B) -> (A (_ B <-> (A e. B \/ A = B)))
2 eloni 2948 . 2 |- (A e. On -> Ord A)
3 eloni 2948 . 2 |- (B e. On -> Ord B)
41, 2, 3syl2an 454 1 |- ((A e. On /\ B e. On) -> (A (_ B <-> (A e. B \/ A = B)))
Colors of variables: wff set class
Syntax hints:   -> wi 3   <-> wb 146   \/ wo 222   /\ wa 223   = wceq 953   e. wcel 955   (_ wss 2037  Ord word 2937  Oncon0 2938
This theorem is referenced by:  onmindif2 3051  onssel 3099  on0eqelt 3114  oaword 4167  omword 4185  oeword 4201  oewordi 4202  r1ord3 4629  cardnn 4796  cardaleph 4857  om2uzlt2 6236
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 959  ax-gen 960  ax-8 961  ax-10 963  ax-11 964  ax-12 965  ax-13 966  ax-14 967  ax-17 968  ax-4 970  ax-5o 972  ax-6o 975  ax-9o 1119  ax-10o 1136  ax-16 1206  ax-11o 1213  ax-ext 1452  ax-sep 2693  ax-pow 2732  ax-pr 2769
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3or 774  df-3an 775  df-ex 978  df-sb 1168  df-eu 1375  df-mo 1376  df-clab 1457  df-cleq 1462  df-clel 1465  df-ne 1579  df-ral 1641  df-rex 1642  df-v 1803  df-dif 2039  df-un 2040  df-in 2041  df-ss 2043  df-nul 2271  df-pw 2392  df-sn 2402  df-pr 2403  df-op 2406  df-uni 2494  df-br 2610  df-opab 2657  df-tr 2671  df-eprel 2821  df-po 2831  df-so 2841  df-fr 2907  df-we 2924  df-ord 2941  df-on 2942
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