Metamath Proof Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >  ordtri2 Structured version   Visualization version   GIF version

Theorem ordtri2 5675
 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 5669 . . . . 5 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ (𝐵𝐴𝐵 = 𝐴)))
2 eqcom 2617 . . . . . . 7 (𝐵 = 𝐴𝐴 = 𝐵)
32orbi2i 540 . . . . . 6 ((𝐵𝐴𝐵 = 𝐴) ↔ (𝐵𝐴𝐴 = 𝐵))
4 orcom 401 . . . . . 6 ((𝐵𝐴𝐴 = 𝐵) ↔ (𝐴 = 𝐵𝐵𝐴))
53, 4bitri 263 . . . . 5 ((𝐵𝐴𝐵 = 𝐴) ↔ (𝐴 = 𝐵𝐵𝐴))
61, 5syl6bb 275 . . . 4 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ (𝐴 = 𝐵𝐵𝐴)))
7 ordtri1 5673 . . . 4 ((Ord 𝐵 ∧ Ord 𝐴) → (𝐵𝐴 ↔ ¬ 𝐴𝐵))
86, 7bitr3d 269 . . 3 ((Ord 𝐵 ∧ Ord 𝐴) → ((𝐴 = 𝐵𝐵𝐴) ↔ ¬ 𝐴𝐵))
98ancoms 468 . 2 ((Ord 𝐴 ∧ Ord 𝐵) → ((𝐴 = 𝐵𝐵𝐴) ↔ ¬ 𝐴𝐵))
109con2bid 343 1 ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴𝐵 ↔ ¬ (𝐴 = 𝐵𝐵𝐴)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∨ wo 382   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ⊆ wss 3540  Ord word 5639 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-tr 4681  df-eprel 4949  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-ord 5643 This theorem is referenced by:  ordtri3  5676  ord0eln0  5696  oaord  7514  omord2  7534  oeord  7555  nnaord  7586  nnmord  7599
 Copyright terms: Public domain W3C validator