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Theorem ordtri2 2233
Description: A trichotomy law for ordinals.
Assertion
Ref Expression
ordtri2 |- ((Ord A /\ Ord B) -> (A e. B <-> -. (A = B \/ B e. A)))

Proof of Theorem ordtri2
StepHypRef Expression
1 ordsseleq 2227 . . . . 5 |- ((Ord B /\ Ord A) -> (B (_ A <-> (B e. A \/ B = A)))
2 cleqcom 1103 . . . . . . 7 |- (B = A <-> A = B)
32orbi2i 214 . . . . . 6 |- ((B e. A \/ B = A) <-> (B e. A \/ A = B))
4 orcom 209 . . . . . 6 |- ((B e. A \/ A = B) <-> (A = B \/ B e. A))
53, 4bitr 151 . . . . 5 |- ((B e. A \/ B = A) <-> (A = B \/ B e. A))
61, 5syl6bb 414 . . . 4 |- ((Ord B /\ Ord A) -> (B (_ A <-> (A = B \/ B e. A)))
7 ordtri1 2231 . . . 4 |- ((Ord B /\ Ord A) -> (B (_ A <-> -. A e. B))
86, 7bitr3d 408 . . 3 |- ((Ord B /\ Ord A) -> ((A = B \/ B e. A) <-> -. A e. B))
98ancoms 334 . 2 |- ((Ord A /\ Ord B) -> ((A = B \/ B e. A) <-> -. A e. B))
109bicon2d 404 1 |- ((Ord A /\ Ord B) -> (A e. B <-> -. (A = B \/ B e. A)))
Colors of variables: wff set class
Syntax hints:  -. wn 1   -> wi 2   <-> wb 127   \/ wo 195   /\ wa 196   = wceq 1091   e. wcel 1092   (_ wss 1487  Ord word 2198
This theorem is referenced by:  ord0eln0 2278  oaord 3149  nnmord 3189  ltsopi 3810
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3or 582  df-3an 583  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-rex 1206  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-tr 2042  df-br 2063  df-opab 2098  df-eprel 2122  df-po 2128  df-so 2138  df-fr 2169  df-we 2186  df-ord 2202
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