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Theorem oaword 7516
 Description: Weak ordering property of ordinal addition. (Contributed by NM, 6-Dec-2004.) (Proof shortened by Andrew Salmon, 22-Oct-2011.)
Assertion
Ref Expression
oaword ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 ↔ (𝐶 +𝑜 𝐴) ⊆ (𝐶 +𝑜 𝐵)))

Proof of Theorem oaword
StepHypRef Expression
1 oaord 7514 . . . 4 ((𝐵 ∈ On ∧ 𝐴 ∈ On ∧ 𝐶 ∈ On) → (𝐵𝐴 ↔ (𝐶 +𝑜 𝐵) ∈ (𝐶 +𝑜 𝐴)))
213com12 1261 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐵𝐴 ↔ (𝐶 +𝑜 𝐵) ∈ (𝐶 +𝑜 𝐴)))
32notbid 307 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (¬ 𝐵𝐴 ↔ ¬ (𝐶 +𝑜 𝐵) ∈ (𝐶 +𝑜 𝐴)))
4 ontri1 5674 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (𝐴𝐵 ↔ ¬ 𝐵𝐴))
543adant3 1074 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 ↔ ¬ 𝐵𝐴))
6 oacl 7502 . . . . 5 ((𝐶 ∈ On ∧ 𝐴 ∈ On) → (𝐶 +𝑜 𝐴) ∈ On)
76ancoms 468 . . . 4 ((𝐴 ∈ On ∧ 𝐶 ∈ On) → (𝐶 +𝑜 𝐴) ∈ On)
873adant2 1073 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐶 +𝑜 𝐴) ∈ On)
9 oacl 7502 . . . . 5 ((𝐶 ∈ On ∧ 𝐵 ∈ On) → (𝐶 +𝑜 𝐵) ∈ On)
109ancoms 468 . . . 4 ((𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐶 +𝑜 𝐵) ∈ On)
11103adant1 1072 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐶 +𝑜 𝐵) ∈ On)
12 ontri1 5674 . . 3 (((𝐶 +𝑜 𝐴) ∈ On ∧ (𝐶 +𝑜 𝐵) ∈ On) → ((𝐶 +𝑜 𝐴) ⊆ (𝐶 +𝑜 𝐵) ↔ ¬ (𝐶 +𝑜 𝐵) ∈ (𝐶 +𝑜 𝐴)))
138, 11, 12syl2anc 691 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → ((𝐶 +𝑜 𝐴) ⊆ (𝐶 +𝑜 𝐵) ↔ ¬ (𝐶 +𝑜 𝐵) ∈ (𝐶 +𝑜 𝐴)))
143, 5, 133bitr4d 299 1 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 ↔ (𝐶 +𝑜 𝐴) ⊆ (𝐶 +𝑜 𝐵)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ w3a 1031   ∈ wcel 1977   ⊆ wss 3540  Oncon0 5640  (class class class)co 6549   +𝑜 coa 7444 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-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847 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-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-oadd 7451 This theorem is referenced by:  oaword1  7519  oaass  7528  omwordri  7539  omlimcl  7545  oaabs2  7612
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