Theorem ufilen 21734

Description: Any infinite set has an ultrafilter on it whose elements are of the same cardinality as the set. Any such ultrafilter is necessarily free. (Contributed by Jeff Hankins, 7-Dec-2009.) (Revised by Stefan O'Rear, 3-Aug-2015.)

Assertion

Ref	Expression
ufilen	⊢ (ω ≼ 𝑋 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋)

Distinct variable group:   𝑥,𝑓,𝑋

Proof of Theorem ufilen

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		reldom 7961	. . . . . 6 ⊢ Rel ≼
2	1	brrelex2i 5159	. . . . 5 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ V)
3		numth3 9292	. . . . 5 ⊢ (𝑋 ∈ V → 𝑋 ∈ dom card)
4	2, 3	syl 17	. . . 4 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ dom card)
5		csdfil 21698	. . . 4 ⊢ ((𝑋 ∈ dom card ∧ ω ≼ 𝑋) → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
6	4, 5	mpancom 703	. . 3 ⊢ (ω ≼ 𝑋 → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
7		filssufil 21716	. . 3 ⊢ ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋) → ∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓)
8	6, 7	syl 17	. 2 ⊢ (ω ≼ 𝑋 → ∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓)
9		elfvex 6221	. . . . . . 7 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑋 ∈ V)
10	9	ad2antlr 763	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑋 ∈ V)
11		ufilfil 21708	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (Fil‘𝑋))
12		filelss 21656	. . . . . . . 8 ⊢ ((𝑓 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
13	11, 12	sylan 488	. . . . . . 7 ⊢ ((𝑓 ∈ (UFil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
14	13	adantll 750	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
15		ssdomg 8001	. . . . . 6 ⊢ (𝑋 ∈ V → (𝑥 ⊆ 𝑋 → 𝑥 ≼ 𝑋))
16	10, 14, 15	sylc 65	. . . . 5 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑥 ≼ 𝑋)
17		filfbas 21652	. . . . . . . . 9 ⊢ (𝑓 ∈ (Fil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
18	11, 17	syl 17	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
19	18	adantl 482	. . . . . . 7 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → 𝑓 ∈ (fBas‘𝑋))
20		fbncp 21643	. . . . . . 7 ⊢ ((𝑓 ∈ (fBas‘𝑋) ∧ 𝑥 ∈ 𝑓) → ¬ (𝑋 ∖ 𝑥) ∈ 𝑓)
21	19, 20	sylan 488	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ¬ (𝑋 ∖ 𝑥) ∈ 𝑓)
22		difss 3737	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∖ 𝑥) ⊆ 𝑋
23		elpw2g 4827	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∈ V → ((𝑋 ∖ 𝑥) ∈ 𝒫 𝑋 ↔ (𝑋 ∖ 𝑥) ⊆ 𝑋))
24	22, 23	mpbiri 248	. . . . . . . . . . . . 13 ⊢ (𝑋 ∈ V → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
25	24	3ad2ant1 1082	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
26		simp2 1062	. . . . . . . . . . . . . 14 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ⊆ 𝑋)
27		dfss4 3858	. . . . . . . . . . . . . 14 ⊢ (𝑥 ⊆ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
28	26, 27	sylib 208	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
29		simp3 1063	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ≺ 𝑋)
30	28, 29	eqbrtrd 4675	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋)
31		difeq2 3722	. . . . . . . . . . . . . 14 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → (𝑋 ∖ 𝑦) = (𝑋 ∖ (𝑋 ∖ 𝑥)))
32	31	breq1d 4663	. . . . . . . . . . . . 13 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → ((𝑋 ∖ 𝑦) ≺ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋))
33	32	elrab 3363	. . . . . . . . . . . 12 ⊢ ((𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ↔ ((𝑋 ∖ 𝑥) ∈ 𝒫 𝑋 ∧ (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋))
34	25, 30, 33	sylanbrc 698	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋})
35		ssel 3597	. . . . . . . . . . 11 ⊢ ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ((𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} → (𝑋 ∖ 𝑥) ∈ 𝑓))
36	34, 35	syl5com 31	. . . . . . . . . 10 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋 ∖ 𝑥) ∈ 𝑓))
37	36	3expa 1265	. . . . . . . . 9 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ 𝑥 ≺ 𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋 ∖ 𝑥) ∈ 𝑓))
38	37	impancom 456	. . . . . . . 8 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓) → (𝑥 ≺ 𝑋 → (𝑋 ∖ 𝑥) ∈ 𝑓))
39	38	con3d 148	. . . . . . 7 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓) → (¬ (𝑋 ∖ 𝑥) ∈ 𝑓 → ¬ 𝑥 ≺ 𝑋))
40	39	impancom 456	. . . . . 6 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ ¬ (𝑋 ∖ 𝑥) ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
41	10, 14, 21, 40	syl21anc 1325	. . . . 5 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
42		bren2 7986	. . . . . 6 ⊢ (𝑥 ≈ 𝑋 ↔ (𝑥 ≼ 𝑋 ∧ ¬ 𝑥 ≺ 𝑋))
43	42	simplbi2 655	. . . . 5 ⊢ (𝑥 ≼ 𝑋 → (¬ 𝑥 ≺ 𝑋 → 𝑥 ≈ 𝑋))
44	16, 41, 43	sylsyld 61	. . . 4 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → 𝑥 ≈ 𝑋))
45	44	ralrimdva 2969	. . 3 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋))
46	45	reximdva 3017	. 2 ⊢ (ω ≼ 𝑋 → (∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋))
47	8, 46	mpd 15	1 ⊢ (ω ≼ 𝑋 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990  ∀wral 2912  ∃wrex 2913  {crab 2916  Vcvv 3200   ∖ cdif 3571   ⊆ wss 3574  𝒫 cpw 4158   class class class wbr 4653  dom cdm 5114  ‘cfv 5888  ωcom 7065   ≈ cen 7952   ≼ cdom 7953   ≺ csdm 7954  cardccrd 8761  fBascfbas 19734  Filcfil 21649  UFilcufil 21703

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538  ax-ac2 9285

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-se 5074  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-isom 5897  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-rpss 6937  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-2o 7561  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-fi 8317  df-oi 8415  df-card 8765  df-ac 8939  df-cda 8990  df-fbas 19743  df-fg 19744  df-fil 21650  df-ufil 21705

This theorem is referenced by: (None)