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Theorem oaabs 7611
 Description: Ordinal addition absorbs a natural number added to the left of a transfinite number. Proposition 8.10 of [TakeutiZaring] p. 59. (Contributed by NM, 9-Dec-2004.) (Proof shortened by Mario Carneiro, 29-May-2015.)
Assertion
Ref Expression
oaabs (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → (𝐴 +𝑜 𝐵) = 𝐵)

Proof of Theorem oaabs
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 ssexg 4732 . . . . . . . . 9 ((ω ⊆ 𝐵𝐵 ∈ On) → ω ∈ V)
21ex 449 . . . . . . . 8 (ω ⊆ 𝐵 → (𝐵 ∈ On → ω ∈ V))
3 omelon2 6969 . . . . . . . 8 (ω ∈ V → ω ∈ On)
42, 3syl6com 36 . . . . . . 7 (𝐵 ∈ On → (ω ⊆ 𝐵 → ω ∈ On))
54imp 444 . . . . . 6 ((𝐵 ∈ On ∧ ω ⊆ 𝐵) → ω ∈ On)
65adantll 746 . . . . 5 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → ω ∈ On)
7 simplr 788 . . . . 5 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → 𝐵 ∈ On)
86, 7jca 553 . . . 4 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → (ω ∈ On ∧ 𝐵 ∈ On))
9 oawordeu 7522 . . . 4 (((ω ∈ On ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → ∃!𝑥 ∈ On (ω +𝑜 𝑥) = 𝐵)
108, 9sylancom 698 . . 3 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → ∃!𝑥 ∈ On (ω +𝑜 𝑥) = 𝐵)
11 reurex 3137 . . 3 (∃!𝑥 ∈ On (ω +𝑜 𝑥) = 𝐵 → ∃𝑥 ∈ On (ω +𝑜 𝑥) = 𝐵)
1210, 11syl 17 . 2 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → ∃𝑥 ∈ On (ω +𝑜 𝑥) = 𝐵)
13 nnon 6963 . . . . . . 7 (𝐴 ∈ ω → 𝐴 ∈ On)
1413ad3antrrr 762 . . . . . 6 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → 𝐴 ∈ On)
156adantr 480 . . . . . 6 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → ω ∈ On)
16 simpr 476 . . . . . 6 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → 𝑥 ∈ On)
17 oaass 7528 . . . . . 6 ((𝐴 ∈ On ∧ ω ∈ On ∧ 𝑥 ∈ On) → ((𝐴 +𝑜 ω) +𝑜 𝑥) = (𝐴 +𝑜 (ω +𝑜 𝑥)))
1814, 15, 16, 17syl3anc 1318 . . . . 5 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → ((𝐴 +𝑜 ω) +𝑜 𝑥) = (𝐴 +𝑜 (ω +𝑜 𝑥)))
19 simpll 786 . . . . . . . 8 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → 𝐴 ∈ ω)
20 oaabslem 7610 . . . . . . . 8 ((ω ∈ On ∧ 𝐴 ∈ ω) → (𝐴 +𝑜 ω) = ω)
216, 19, 20syl2anc 691 . . . . . . 7 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → (𝐴 +𝑜 ω) = ω)
2221adantr 480 . . . . . 6 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → (𝐴 +𝑜 ω) = ω)
2322oveq1d 6564 . . . . 5 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → ((𝐴 +𝑜 ω) +𝑜 𝑥) = (ω +𝑜 𝑥))
2418, 23eqtr3d 2646 . . . 4 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → (𝐴 +𝑜 (ω +𝑜 𝑥)) = (ω +𝑜 𝑥))
25 oveq2 6557 . . . . 5 ((ω +𝑜 𝑥) = 𝐵 → (𝐴 +𝑜 (ω +𝑜 𝑥)) = (𝐴 +𝑜 𝐵))
26 id 22 . . . . 5 ((ω +𝑜 𝑥) = 𝐵 → (ω +𝑜 𝑥) = 𝐵)
2725, 26eqeq12d 2625 . . . 4 ((ω +𝑜 𝑥) = 𝐵 → ((𝐴 +𝑜 (ω +𝑜 𝑥)) = (ω +𝑜 𝑥) ↔ (𝐴 +𝑜 𝐵) = 𝐵))
2824, 27syl5ibcom 234 . . 3 ((((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) ∧ 𝑥 ∈ On) → ((ω +𝑜 𝑥) = 𝐵 → (𝐴 +𝑜 𝐵) = 𝐵))
2928rexlimdva 3013 . 2 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → (∃𝑥 ∈ On (ω +𝑜 𝑥) = 𝐵 → (𝐴 +𝑜 𝐵) = 𝐵))
3012, 29mpd 15 1 (((𝐴 ∈ ω ∧ 𝐵 ∈ On) ∧ ω ⊆ 𝐵) → (𝐴 +𝑜 𝐵) = 𝐵)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∃wrex 2897  ∃!wreu 2898  Vcvv 3173   ⊆ wss 3540  Oncon0 5640  (class class class)co 6549  ωcom 6957   +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-rmo 2904  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-int 4411  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: (None)
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