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Theorem ordtri2 5746
Description: A trichotomy law for ordinals. (Contributed by NM, 25-Nov-1995.)
Assertion
Ref Expression
ordtri2 ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴𝐵 ↔ ¬ (𝐴 = 𝐵𝐵𝐴)))

Proof of Theorem ordtri2
StepHypRef Expression
1 ordsseleq 5740 . . . . 5 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ (𝐵𝐴𝐵 = 𝐴)))
2 eqcom 2627 . . . . . . 7 (𝐵 = 𝐴𝐴 = 𝐵)
32orbi2i 541 . . . . . 6 ((𝐵𝐴𝐵 = 𝐴) ↔ (𝐵𝐴𝐴 = 𝐵))
4 orcom 402 . . . . . 6 ((𝐵𝐴𝐴 = 𝐵) ↔ (𝐴 = 𝐵𝐵𝐴))
53, 4bitri 264 . . . . 5 ((𝐵𝐴𝐵 = 𝐴) ↔ (𝐴 = 𝐵𝐵𝐴))
61, 5syl6bb 276 . . . 4 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ (𝐴 = 𝐵𝐵𝐴)))
7 ordtri1 5744 . . . 4 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ ¬ 𝐴𝐵))
86, 7bitr3d 270 . . 3 ((Ord 𝐵 ∧ Ord 𝐴) → ((𝐴 = 𝐵𝐵𝐴) ↔ ¬ 𝐴𝐵))
98ancoms 469 . 2 ((Ord 𝐴 ∧ Ord 𝐵) → ((𝐴 = 𝐵𝐵𝐴) ↔ ¬ 𝐴𝐵))
109con2bid 344 1 ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴𝐵 ↔ ¬ (𝐴 = 𝐵𝐵𝐴)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 383  wa 384   = wceq 1481  wcel 1988  wss 3567  Ord word 5710
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-sep 4772  ax-nul 4780  ax-pr 4897
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-ral 2914  df-rex 2915  df-rab 2918  df-v 3197  df-sbc 3430  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-pss 3583  df-nul 3908  df-if 4078  df-sn 4169  df-pr 4171  df-op 4175  df-uni 4428  df-br 4645  df-opab 4704  df-tr 4744  df-eprel 5019  df-po 5025  df-so 5026  df-fr 5063  df-we 5065  df-ord 5714
This theorem is referenced by:  ordtri3  5747  ord0eln0  5767  oaord  7612  omord2  7632  oeord  7653  nnaord  7684  nnmord  7697  noextenddif  31795
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