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Theorem oaord 8561
Description: Ordering property of ordinal addition. Proposition 8.4 of [TakeutiZaring] p. 58 and its converse. (Contributed by NM, 5-Dec-2004.)
Assertion
Ref Expression
oaord ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 ↔ (𝐶 +o 𝐴) ∈ (𝐶 +o 𝐵)))

Proof of Theorem oaord
StepHypRef Expression
1 oaordi 8560 . . 3 ((𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 → (𝐶 +o 𝐴) ∈ (𝐶 +o 𝐵)))
213adant1 1128 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 → (𝐶 +o 𝐴) ∈ (𝐶 +o 𝐵)))
3 oveq2 7422 . . . . . 6 (𝐴 = 𝐵 → (𝐶 +o 𝐴) = (𝐶 +o 𝐵))
43a1i 11 . . . . 5 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴 = 𝐵 → (𝐶 +o 𝐴) = (𝐶 +o 𝐵)))
5 oaordi 8560 . . . . . 6 ((𝐴 ∈ On ∧ 𝐶 ∈ On) → (𝐵𝐴 → (𝐶 +o 𝐵) ∈ (𝐶 +o 𝐴)))
653adant2 1129 . . . . 5 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐵𝐴 → (𝐶 +o 𝐵) ∈ (𝐶 +o 𝐴)))
74, 6orim12d 963 . . . 4 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → ((𝐴 = 𝐵𝐵𝐴) → ((𝐶 +o 𝐴) = (𝐶 +o 𝐵) ∨ (𝐶 +o 𝐵) ∈ (𝐶 +o 𝐴))))
87con3d 152 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (¬ ((𝐶 +o 𝐴) = (𝐶 +o 𝐵) ∨ (𝐶 +o 𝐵) ∈ (𝐶 +o 𝐴)) → ¬ (𝐴 = 𝐵𝐵𝐴)))
9 df-3an 1087 . . . . . 6 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ↔ ((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ 𝐶 ∈ On))
10 ancom 460 . . . . . 6 (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ 𝐶 ∈ On) ↔ (𝐶 ∈ On ∧ (𝐴 ∈ On ∧ 𝐵 ∈ On)))
11 anandi 675 . . . . . 6 ((𝐶 ∈ On ∧ (𝐴 ∈ On ∧ 𝐵 ∈ On)) ↔ ((𝐶 ∈ On ∧ 𝐴 ∈ On) ∧ (𝐶 ∈ On ∧ 𝐵 ∈ On)))
129, 10, 113bitri 297 . . . . 5 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) ↔ ((𝐶 ∈ On ∧ 𝐴 ∈ On) ∧ (𝐶 ∈ On ∧ 𝐵 ∈ On)))
13 oacl 8549 . . . . . . 7 ((𝐶 ∈ On ∧ 𝐴 ∈ On) → (𝐶 +o 𝐴) ∈ On)
14 eloni 6373 . . . . . . 7 ((𝐶 +o 𝐴) ∈ On → Ord (𝐶 +o 𝐴))
1513, 14syl 17 . . . . . 6 ((𝐶 ∈ On ∧ 𝐴 ∈ On) → Ord (𝐶 +o 𝐴))
16 oacl 8549 . . . . . . 7 ((𝐶 ∈ On ∧ 𝐵 ∈ On) → (𝐶 +o 𝐵) ∈ On)
17 eloni 6373 . . . . . . 7 ((𝐶 +o 𝐵) ∈ On → Ord (𝐶 +o 𝐵))
1816, 17syl 17 . . . . . 6 ((𝐶 ∈ On ∧ 𝐵 ∈ On) → Ord (𝐶 +o 𝐵))
1915, 18anim12i 612 . . . . 5 (((𝐶 ∈ On ∧ 𝐴 ∈ On) ∧ (𝐶 ∈ On ∧ 𝐵 ∈ On)) → (Ord (𝐶 +o 𝐴) ∧ Ord (𝐶 +o 𝐵)))
2012, 19sylbi 216 . . . 4 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (Ord (𝐶 +o 𝐴) ∧ Ord (𝐶 +o 𝐵)))
21 ordtri2 6398 . . . 4 ((Ord (𝐶 +o 𝐴) ∧ Ord (𝐶 +o 𝐵)) → ((𝐶 +o 𝐴) ∈ (𝐶 +o 𝐵) ↔ ¬ ((𝐶 +o 𝐴) = (𝐶 +o 𝐵) ∨ (𝐶 +o 𝐵) ∈ (𝐶 +o 𝐴))))
2220, 21syl 17 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → ((𝐶 +o 𝐴) ∈ (𝐶 +o 𝐵) ↔ ¬ ((𝐶 +o 𝐴) = (𝐶 +o 𝐵) ∨ (𝐶 +o 𝐵) ∈ (𝐶 +o 𝐴))))
23 eloni 6373 . . . . . 6 (𝐴 ∈ On → Ord 𝐴)
24 eloni 6373 . . . . . 6 (𝐵 ∈ On → Ord 𝐵)
2523, 24anim12i 612 . . . . 5 ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (Ord 𝐴 ∧ Ord 𝐵))
26253adant3 1130 . . . 4 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (Ord 𝐴 ∧ Ord 𝐵))
27 ordtri2 6398 . . . 4 ((Ord 𝐴 ∧ Ord 𝐵) → (𝐴𝐵 ↔ ¬ (𝐴 = 𝐵𝐵𝐴)))
2826, 27syl 17 . . 3 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → (𝐴𝐵 ↔ ¬ (𝐴 = 𝐵𝐵𝐴)))
298, 22, 283imtr4d 294 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ On ∧ 𝐶 ∈ On) → ((𝐶 +o 𝐴) ∈ (𝐶 +o 𝐵) → 𝐴𝐵))
302, 29impbid 211 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 205  wa 395  wo 846  w3a 1085   = wceq 1534  wcel 2099  Ord word 6362  Oncon0 6363  (class class class)co 7414   +o coa 8477
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699  ax-rep 5279  ax-sep 5293  ax-nul 5300  ax-pr 5423  ax-un 7734
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3or 1086  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2530  df-eu 2559  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ne 2937  df-ral 3058  df-rex 3067  df-reu 3373  df-rab 3429  df-v 3472  df-sbc 3776  df-csb 3891  df-dif 3948  df-un 3950  df-in 3952  df-ss 3962  df-pss 3964  df-nul 4319  df-if 4525  df-pw 4600  df-sn 4625  df-pr 4627  df-op 4631  df-uni 4904  df-iun 4993  df-br 5143  df-opab 5205  df-mpt 5226  df-tr 5260  df-id 5570  df-eprel 5576  df-po 5584  df-so 5585  df-fr 5627  df-we 5629  df-xp 5678  df-rel 5679  df-cnv 5680  df-co 5681  df-dm 5682  df-rn 5683  df-res 5684  df-ima 5685  df-pred 6299  df-ord 6366  df-on 6367  df-lim 6368  df-suc 6369  df-iota 6494  df-fun 6544  df-fn 6545  df-f 6546  df-f1 6547  df-fo 6548  df-f1o 6549  df-fv 6550  df-ov 7417  df-oprab 7418  df-mpo 7419  df-om 7865  df-2nd 7988  df-frecs 8280  df-wrecs 8311  df-recs 8385  df-rdg 8424  df-oadd 8484
This theorem is referenced by:  oacan  8562  oaword  8563  oaord1  8565  oa00  8573  oalimcl  8574  oaass  8575  odi  8593  oneo  8595  omeulem1  8596  omeulem2  8597  oeeui  8616  omxpenlem  9091  cantnflt  9689  cantnflem1d  9705  cantnflem1  9706  oaord3  42715  oawordex2  42749
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