MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  cdainflem Structured version   Visualization version   GIF version

Theorem cdainflem 8957
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 8173 . . . 4 ((𝐴 ≺ ω ∧ 𝐵 ≺ ω) → (𝐴𝐵) ≺ ω)
2 sdomnen 7928 . . . 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 7904 . . . . . . . . . 10 Rel ≈
76brrelexi 5118 . . . . . . . . 9 ((𝐴𝐵) ≈ ω → (𝐴𝐵) ∈ V)
8 ssun1 3754 . . . . . . . . 9 𝐴 ⊆ (𝐴𝐵)
9 ssdomg 7945 . . . . . . . . 9 ((𝐴𝐵) ∈ V → (𝐴 ⊆ (𝐴𝐵) → 𝐴 ≼ (𝐴𝐵)))
107, 8, 9mpisyl 21 . . . . . . . 8 ((𝐴𝐵) ≈ ω → 𝐴 ≼ (𝐴𝐵))
11 domentr 7959 . . . . . . . 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 7930 . . . . . 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 3755 . . . . . . . . 9 𝐵 ⊆ (𝐴𝐵)
18 ssdomg 7945 . . . . . . . . 9 ((𝐴𝐵) ∈ V → (𝐵 ⊆ (𝐴𝐵) → 𝐵 ≼ (𝐴𝐵)))
197, 17, 18mpisyl 21 . . . . . . . 8 ((𝐴𝐵) ≈ ω → 𝐵 ≼ (𝐴𝐵))
20 domentr 7959 . . . . . . . 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 7930 . . . . . 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 3186  cun 3553  wss 3555   class class class wbr 4613  ωcom 7012  cen 7896  cdom 7897  csdm 7898
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 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902
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 2912  df-rex 2913  df-reu 2914  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-oadd 7509  df-er 7687  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903
This theorem is referenced by:  cdainf  8958
  Copyright terms: Public domain W3C validator