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Theorem ordtri2or 6153
Description: A trichotomy law for ordinal classes. (Contributed by NM, 13-Sep-2003.) (Proof shortened by Andrew Salmon, 12-Aug-2011.)
Assertion
Ref Expression
ordtri2or ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴𝐵𝐵𝐴))

Proof of Theorem ordtri2or
StepHypRef Expression
1 ordtri1 6091 . . . 4 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ ¬ 𝐴𝐵))
21ancoms 459 . . 3 ((Ord 𝐴 ∧ Ord 𝐵) → (𝐵𝐴 ↔ ¬ 𝐴𝐵))
32biimprd 249 . 2 ((Ord 𝐴 ∧ Ord 𝐵) → (¬ 𝐴𝐵𝐵𝐴))
43orrd 858 1 ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴𝐵𝐵𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 207  wa 396  wo 842  wcel 2079  wss 3854  Ord word 6057
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1775  ax-4 1789  ax-5 1886  ax-6 1945  ax-7 1990  ax-8 2081  ax-9 2089  ax-10 2110  ax-11 2124  ax-12 2139  ax-13 2342  ax-ext 2767  ax-sep 5088  ax-nul 5095  ax-pr 5214
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 843  df-3or 1079  df-3an 1080  df-tru 1523  df-ex 1760  df-nf 1764  df-sb 2041  df-mo 2574  df-eu 2610  df-clab 2774  df-cleq 2786  df-clel 2861  df-nfc 2933  df-ne 2983  df-ral 3108  df-rex 3109  df-rab 3112  df-v 3434  df-sbc 3702  df-dif 3857  df-un 3859  df-in 3861  df-ss 3869  df-pss 3871  df-nul 4207  df-if 4376  df-sn 4467  df-pr 4469  df-op 4473  df-uni 4740  df-br 4957  df-opab 5019  df-tr 5058  df-eprel 5345  df-po 5354  df-so 5355  df-fr 5394  df-we 5396  df-ord 6061
This theorem is referenced by:  ordtri2or2  6154  onun2i  6173  ordunisuc2  7406  oaass  8028  alephdom  9342  iscard3  9354  noetalem3  32773
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