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Theorem cdainflem 8973
Description: Any partition of omega into two pieces (which may be disjoint) contains an infinite subset. (Contributed by Mario Carneiro, 11-Feb-2013.)
Assertion
Ref Expression
cdainflem ((𝐴𝐵) ≈ ω → (𝐴 ≈ ω ∨ 𝐵 ≈ ω))

Proof of Theorem cdainflem
StepHypRef Expression
1 unfi2 8189 . . . 4 ((𝐴 ≺ ω ∧ 𝐵 ≺ ω) → (𝐴𝐵) ≺ ω)
2 sdomnen 7944 . . . 4 ((𝐴𝐵) ≺ ω → ¬ (𝐴𝐵) ≈ ω)
31, 2syl 17 . . 3 ((𝐴 ≺ ω ∧ 𝐵 ≺ ω) → ¬ (𝐴𝐵) ≈ ω)
43con2i 134 . 2 ((𝐴𝐵) ≈ ω → ¬ (𝐴 ≺ ω ∧ 𝐵 ≺ ω))
5 ianor 509 . . 3 (¬ (𝐴 ≺ ω ∧ 𝐵 ≺ ω) ↔ (¬ 𝐴 ≺ ω ∨ ¬ 𝐵 ≺ ω))
6 relen 7920 . . . . . . . . . 10 Rel ≈
76brrelexi 5128 . . . . . . . . 9 ((𝐴𝐵) ≈ ω → (𝐴𝐵) ∈ V)
8 ssun1 3760 . . . . . . . . 9 𝐴 ⊆ (𝐴𝐵)
9 ssdomg 7961 . . . . . . . . 9 ((𝐴𝐵) ∈ V → (𝐴 ⊆ (𝐴𝐵) → 𝐴 ≼ (𝐴𝐵)))
107, 8, 9mpisyl 21 . . . . . . . 8 ((𝐴𝐵) ≈ ω → 𝐴 ≼ (𝐴𝐵))
11 domentr 7975 . . . . . . . 8 ((𝐴 ≼ (𝐴𝐵) ∧ (𝐴𝐵) ≈ ω) → 𝐴 ≼ ω)
1210, 11mpancom 702 . . . . . . 7 ((𝐴𝐵) ≈ ω → 𝐴 ≼ ω)
1312anim1i 591 . . . . . 6 (((𝐴𝐵) ≈ ω ∧ ¬ 𝐴 ≺ ω) → (𝐴 ≼ ω ∧ ¬ 𝐴 ≺ ω))
14 bren2 7946 . . . . . 6 (𝐴 ≈ ω ↔ (𝐴 ≼ ω ∧ ¬ 𝐴 ≺ ω))
1513, 14sylibr 224 . . . . 5 (((𝐴𝐵) ≈ ω ∧ ¬ 𝐴 ≺ ω) → 𝐴 ≈ ω)
1615ex 450 . . . 4 ((𝐴𝐵) ≈ ω → (¬ 𝐴 ≺ ω → 𝐴 ≈ ω))
17 ssun2 3761 . . . . . . . . 9 𝐵 ⊆ (𝐴𝐵)
18 ssdomg 7961 . . . . . . . . 9 ((𝐴𝐵) ∈ V → (𝐵 ⊆ (𝐴𝐵) → 𝐵 ≼ (𝐴𝐵)))
197, 17, 18mpisyl 21 . . . . . . . 8 ((𝐴𝐵) ≈ ω → 𝐵 ≼ (𝐴𝐵))
20 domentr 7975 . . . . . . . 8 ((𝐵 ≼ (𝐴𝐵) ∧ (𝐴𝐵) ≈ ω) → 𝐵 ≼ ω)
2119, 20mpancom 702 . . . . . . 7 ((𝐴𝐵) ≈ ω → 𝐵 ≼ ω)
2221anim1i 591 . . . . . 6 (((𝐴𝐵) ≈ ω ∧ ¬ 𝐵 ≺ ω) → (𝐵 ≼ ω ∧ ¬ 𝐵 ≺ ω))
23 bren2 7946 . . . . . 6 (𝐵 ≈ ω ↔ (𝐵 ≼ ω ∧ ¬ 𝐵 ≺ ω))
2422, 23sylibr 224 . . . . 5 (((𝐴𝐵) ≈ ω ∧ ¬ 𝐵 ≺ ω) → 𝐵 ≈ ω)
2524ex 450 . . . 4 ((𝐴𝐵) ≈ ω → (¬ 𝐵 ≺ ω → 𝐵 ≈ ω))
2616, 25orim12d 882 . . 3 ((𝐴𝐵) ≈ ω → ((¬ 𝐴 ≺ ω ∨ ¬ 𝐵 ≺ ω) → (𝐴 ≈ ω ∨ 𝐵 ≈ ω)))
275, 26syl5bi 232 . 2 ((𝐴𝐵) ≈ ω → (¬ (𝐴 ≺ ω ∧ 𝐵 ≺ ω) → (𝐴 ≈ ω ∨ 𝐵 ≈ ω)))
284, 27mpd 15 1 ((𝐴𝐵) ≈ ω → (𝐴 ≈ ω ∨ 𝐵 ≈ ω))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wo 383  wa 384  wcel 1987  Vcvv 3190  cun 3558  wss 3560   class class class wbr 4623  ωcom 7027  cen 7912  cdom 7913  csdm 7914
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4751  ax-nul 4759  ax-pow 4813  ax-pr 4877  ax-un 6914
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2913  df-rex 2914  df-reu 2915  df-rab 2917  df-v 3192  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-pss 3576  df-nul 3898  df-if 4065  df-pw 4138  df-sn 4156  df-pr 4158  df-tp 4160  df-op 4162  df-uni 4410  df-int 4448  df-iun 4494  df-br 4624  df-opab 4684  df-mpt 4685  df-tr 4723  df-eprel 4995  df-id 4999  df-po 5005  df-so 5006  df-fr 5043  df-we 5045  df-xp 5090  df-rel 5091  df-cnv 5092  df-co 5093  df-dm 5094  df-rn 5095  df-res 5096  df-ima 5097  df-pred 5649  df-ord 5695  df-on 5696  df-lim 5697  df-suc 5698  df-iota 5820  df-fun 5859  df-fn 5860  df-f 5861  df-f1 5862  df-fo 5863  df-f1o 5864  df-fv 5865  df-ov 6618  df-oprab 6619  df-mpt2 6620  df-om 7028  df-wrecs 7367  df-recs 7428  df-rdg 7466  df-oadd 7524  df-er 7702  df-en 7916  df-dom 7917  df-sdom 7918  df-fin 7919
This theorem is referenced by:  cdainf  8974
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