Theorem ufilen 22541

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 8518	. . . . . 6 ⊢ Rel ≼
2	1	brrelex2i 5612	. . . . 5 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ V)
3		numth3 9895	. . . . 5 ⊢ (𝑋 ∈ V → 𝑋 ∈ dom card)
4	2, 3	syl 17	. . . 4 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ dom card)
5		csdfil 22505	. . . 4 ⊢ ((𝑋 ∈ dom card ∧ ω ≼ 𝑋) → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
6	4, 5	mpancom 686	. . 3 ⊢ (ω ≼ 𝑋 → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
7		filssufil 22523	. . 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 6706	. . . . . . 7 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑋 ∈ V)
10	9	ad2antlr 725	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑋 ∈ V)
11		ufilfil 22515	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (Fil‘𝑋))
12		filelss 22463	. . . . . . . 8 ⊢ ((𝑓 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
13	11, 12	sylan 582	. . . . . . 7 ⊢ ((𝑓 ∈ (UFil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
14	13	adantll 712	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
15		ssdomg 8558	. . . . . 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 22459	. . . . . . . . 9 ⊢ (𝑓 ∈ (Fil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
18	11, 17	syl 17	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
19	18	adantl 484	. . . . . . 7 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → 𝑓 ∈ (fBas‘𝑋))
20		fbncp 22450	. . . . . . 7 ⊢ ((𝑓 ∈ (fBas‘𝑋) ∧ 𝑥 ∈ 𝑓) → ¬ (𝑋 ∖ 𝑥) ∈ 𝑓)
21	19, 20	sylan 582	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ¬ (𝑋 ∖ 𝑥) ∈ 𝑓)
22		difeq2 4096	. . . . . . . . . . . . 13 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → (𝑋 ∖ 𝑦) = (𝑋 ∖ (𝑋 ∖ 𝑥)))
23	22	breq1d 5079	. . . . . . . . . . . 12 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → ((𝑋 ∖ 𝑦) ≺ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋))
24		difss 4111	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∖ 𝑥) ⊆ 𝑋
25		elpw2g 5250	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∈ V → ((𝑋 ∖ 𝑥) ∈ 𝒫 𝑋 ↔ (𝑋 ∖ 𝑥) ⊆ 𝑋))
26	24, 25	mpbiri 260	. . . . . . . . . . . . 13 ⊢ (𝑋 ∈ V → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
27	26	3ad2ant1 1129	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
28		simp2 1133	. . . . . . . . . . . . . 14 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ⊆ 𝑋)
29		dfss4 4238	. . . . . . . . . . . . . 14 ⊢ (𝑥 ⊆ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
30	28, 29	sylib 220	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
31		simp3 1134	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ≺ 𝑋)
32	30, 31	eqbrtrd 5091	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋)
33	23, 27, 32	elrabd 3685	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋})
34		ssel 3964	. . . . . . . . . . 11 ⊢ ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ((𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} → (𝑋 ∖ 𝑥) ∈ 𝑓))
35	33, 34	syl5com 31	. . . . . . . . . 10 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋 ∖ 𝑥) ∈ 𝑓))
36	35	3expa 1114	. . . . . . . . 9 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ 𝑥 ≺ 𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋 ∖ 𝑥) ∈ 𝑓))
37	36	impancom 454	. . . . . . . 8 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓) → (𝑥 ≺ 𝑋 → (𝑋 ∖ 𝑥) ∈ 𝑓))
38	37	con3d 155	. . . . . . 7 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓) → (¬ (𝑋 ∖ 𝑥) ∈ 𝑓 → ¬ 𝑥 ≺ 𝑋))
39	38	impancom 454	. . . . . 6 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ ¬ (𝑋 ∖ 𝑥) ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
40	10, 14, 21, 39	syl21anc 835	. . . . 5 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
41		bren2 8543	. . . . . 6 ⊢ (𝑥 ≈ 𝑋 ↔ (𝑥 ≼ 𝑋 ∧ ¬ 𝑥 ≺ 𝑋))
42	41	simplbi2 503	. . . . 5 ⊢ (𝑥 ≼ 𝑋 → (¬ 𝑥 ≺ 𝑋 → 𝑥 ≈ 𝑋))
43	16, 40, 42	sylsyld 61	. . . 4 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → 𝑥 ≈ 𝑋))
44	43	ralrimdva 3192	. . 3 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋))
45	44	reximdva 3277	. 2 ⊢ (ω ≼ 𝑋 → (∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋))
46	8, 45	mpd 15	1 ⊢ (ω ≼ 𝑋 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 398   ∧ w3a 1083   = wceq 1536   ∈ wcel 2113  ∀wral 3141  ∃wrex 3142  {crab 3145  Vcvv 3497   ∖ cdif 3936   ⊆ wss 3939  𝒫 cpw 4542   class class class wbr 5069  dom cdm 5558  ‘cfv 6358  ωcom 7583   ≈ cen 8509   ≼ cdom 8510   ≺ csdm 8511  cardccrd 9367  fBascfbas 20536  Filcfil 22456  UFilcufil 22510

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796  ax-rep 5193  ax-sep 5206  ax-nul 5213  ax-pow 5269  ax-pr 5333  ax-un 7464  ax-inf2 9107  ax-ac2 9888

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-ne 3020  df-nel 3127  df-ral 3146  df-rex 3147  df-reu 3148  df-rmo 3149  df-rab 3150  df-v 3499  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-pss 3957  df-nul 4295  df-if 4471  df-pw 4544  df-sn 4571  df-pr 4573  df-tp 4575  df-op 4577  df-uni 4842  df-int 4880  df-iun 4924  df-br 5070  df-opab 5132  df-mpt 5150  df-tr 5176  df-id 5463  df-eprel 5468  df-po 5477  df-so 5478  df-fr 5517  df-se 5518  df-we 5519  df-xp 5564  df-rel 5565  df-cnv 5566  df-co 5567  df-dm 5568  df-rn 5569  df-res 5570  df-ima 5571  df-pred 6151  df-ord 6197  df-on 6198  df-lim 6199  df-suc 6200  df-iota 6317  df-fun 6360  df-fn 6361  df-f 6362  df-f1 6363  df-fo 6364  df-f1o 6365  df-fv 6366  df-isom 6367  df-riota 7117  df-ov 7162  df-oprab 7163  df-mpo 7164  df-rpss 7452  df-om 7584  df-1st 7692  df-2nd 7693  df-wrecs 7950  df-recs 8011  df-rdg 8049  df-1o 8105  df-2o 8106  df-oadd 8109  df-er 8292  df-en 8513  df-dom 8514  df-sdom 8515  df-fin 8516  df-fi 8878  df-oi 8977  df-dju 9333  df-card 9371  df-ac 9545  df-fbas 20545  df-fg 20546  df-fil 22457  df-ufil 22512

This theorem is referenced by: (None)