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Theorem domtriord 8647
 Description: Dominance is trichotomous in the restricted case of ordinal numbers. (Contributed by Jeff Hankins, 24-Oct-2009.)
Assertion
Ref Expression
domtriord ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴𝐵 ↔ ¬ 𝐵𝐴))

Proof of Theorem domtriord
StepHypRef Expression
1 sbth 8621 . . . . 5 ((𝐵𝐴𝐴𝐵) → 𝐵𝐴)
21expcom 417 . . . 4 (𝐴𝐵 → (𝐵𝐴𝐵𝐴))
32a1i 11 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴𝐵 → (𝐵𝐴𝐵𝐴)))
4 iman 405 . . . 4 ((𝐵𝐴𝐵𝐴) ↔ ¬ (𝐵𝐴 ∧ ¬ 𝐵𝐴))
5 brsdom 8515 . . . 4 (𝐵𝐴 ↔ (𝐵𝐴 ∧ ¬ 𝐵𝐴))
64, 5xchbinxr 338 . . 3 ((𝐵𝐴𝐵𝐴) ↔ ¬ 𝐵𝐴)
73, 6syl6ib 254 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴𝐵 → ¬ 𝐵𝐴))
8 onelss 6201 . . . . . . . . . 10 (𝐵 ∈ On → (𝐴𝐵𝐴𝐵))
9 ssdomg 8538 . . . . . . . . . 10 (𝐵 ∈ On → (𝐴𝐵𝐴𝐵))
108, 9syld 47 . . . . . . . . 9 (𝐵 ∈ On → (𝐴𝐵𝐴𝐵))
1110adantl 485 . . . . . . . 8 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴𝐵𝐴𝐵))
1211con3d 155 . . . . . . 7 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (¬ 𝐴𝐵 → ¬ 𝐴𝐵))
13 ontri1 6193 . . . . . . . 8 ((𝐵 ∈ On ∧ 𝐴 ∈ On) → (𝐵𝐴 ↔ ¬ 𝐴𝐵))
1413ancoms 462 . . . . . . 7 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐵𝐴 ↔ ¬ 𝐴𝐵))
1512, 14sylibrd 262 . . . . . 6 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (¬ 𝐴𝐵𝐵𝐴))
16 ssdomg 8538 . . . . . . 7 (𝐴 ∈ On → (𝐵𝐴𝐵𝐴))
1716adantr 484 . . . . . 6 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐵𝐴𝐵𝐴))
1815, 17syld 47 . . . . 5 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (¬ 𝐴𝐵𝐵𝐴))
19 ensym 8541 . . . . . . 7 (𝐵𝐴𝐴𝐵)
20 endom 8519 . . . . . . 7 (𝐴𝐵𝐴𝐵)
2119, 20syl 17 . . . . . 6 (𝐵𝐴𝐴𝐵)
2221con3i 157 . . . . 5 𝐴𝐵 → ¬ 𝐵𝐴)
2318, 22jca2 517 . . . 4 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (¬ 𝐴𝐵 → (𝐵𝐴 ∧ ¬ 𝐵𝐴)))
2423, 5syl6ibr 255 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (¬ 𝐴𝐵𝐵𝐴))
2524con1d 147 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (¬ 𝐵𝐴𝐴𝐵))
267, 25impbid 215 1 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴𝐵 ↔ ¬ 𝐵𝐴))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 399   ∈ wcel 2111   ⊆ wss 3881   class class class wbr 5030  Oncon0 6159   ≈ cen 8489   ≼ cdom 8490   ≺ csdm 8491 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7441 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-rab 3115  df-v 3443  df-sbc 3721  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-tr 5137  df-id 5425  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-we 5480  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-ord 6162  df-on 6163  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-er 8272  df-en 8493  df-dom 8494  df-sdom 8495 This theorem is referenced by:  sdomel  8648  cardsdomel  9387  alephord  9486  alephsucdom  9490  alephdom2  9498
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