Theorem ufilen 23815

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 8878	. . . . . 6 ⊢ Rel ≼
2	1	brrelex2i 5676	. . . . 5 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ V)
3		numth3 10364	. . . . 5 ⊢ (𝑋 ∈ V → 𝑋 ∈ dom card)
4	2, 3	syl 17	. . . 4 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ dom card)
5		csdfil 23779	. . . 4 ⊢ ((𝑋 ∈ dom card ∧ ω ≼ 𝑋) → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
6	4, 5	mpancom 688	. . 3 ⊢ (ω ≼ 𝑋 → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
7		filssufil 23797	. . 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 6858	. . . . . . 7 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑋 ∈ V)
10	9	ad2antlr 727	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑋 ∈ V)
11		ufilfil 23789	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (Fil‘𝑋))
12		filelss 23737	. . . . . . . 8 ⊢ ((𝑓 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
13	11, 12	sylan 580	. . . . . . 7 ⊢ ((𝑓 ∈ (UFil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
14	13	adantll 714	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
15		ssdomg 8925	. . . . . 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 23733	. . . . . . . . 9 ⊢ (𝑓 ∈ (Fil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
18	11, 17	syl 17	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
19	18	adantl 481	. . . . . . 7 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → 𝑓 ∈ (fBas‘𝑋))
20		fbncp 23724	. . . . . . 7 ⊢ ((𝑓 ∈ (fBas‘𝑋) ∧ 𝑥 ∈ 𝑓) → ¬ (𝑋 ∖ 𝑥) ∈ 𝑓)
21	19, 20	sylan 580	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ¬ (𝑋 ∖ 𝑥) ∈ 𝑓)
22		difeq2 4071	. . . . . . . . . . . . 13 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → (𝑋 ∖ 𝑦) = (𝑋 ∖ (𝑋 ∖ 𝑥)))
23	22	breq1d 5102	. . . . . . . . . . . 12 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → ((𝑋 ∖ 𝑦) ≺ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋))
24		difss 4087	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∖ 𝑥) ⊆ 𝑋
25		elpw2g 5272	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∈ V → ((𝑋 ∖ 𝑥) ∈ 𝒫 𝑋 ↔ (𝑋 ∖ 𝑥) ⊆ 𝑋))
26	24, 25	mpbiri 258	. . . . . . . . . . . . 13 ⊢ (𝑋 ∈ V → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
27	26	3ad2ant1 1133	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
28		simp2 1137	. . . . . . . . . . . . . 14 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ⊆ 𝑋)
29		dfss4 4220	. . . . . . . . . . . . . 14 ⊢ (𝑥 ⊆ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
30	28, 29	sylib 218	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
31		simp3 1138	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ≺ 𝑋)
32	30, 31	eqbrtrd 5114	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋)
33	23, 27, 32	elrabd 3650	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋})
34		ssel 3929	. . . . . . . . . . 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 1118	. . . . . . . . 9 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ 𝑥 ≺ 𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋 ∖ 𝑥) ∈ 𝑓))
37	36	impancom 451	. . . . . . . 8 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓) → (𝑥 ≺ 𝑋 → (𝑋 ∖ 𝑥) ∈ 𝑓))
38	37	con3d 152	. . . . . . 7 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓) → (¬ (𝑋 ∖ 𝑥) ∈ 𝑓 → ¬ 𝑥 ≺ 𝑋))
39	38	impancom 451	. . . . . 6 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ ¬ (𝑋 ∖ 𝑥) ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
40	10, 14, 21, 39	syl21anc 837	. . . . 5 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
41		bren2 8908	. . . . . 6 ⊢ (𝑥 ≈ 𝑋 ↔ (𝑥 ≼ 𝑋 ∧ ¬ 𝑥 ≺ 𝑋))
42	41	simplbi2 500	. . . . 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 3129	. . 3 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋))
45	44	reximdva 3142	. 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 395   ∧ w3a 1086   = wceq 1540   ∈ wcel 2109  ∀wral 3044  ∃wrex 3053  {crab 3394  Vcvv 3436   ∖ cdif 3900   ⊆ wss 3903  𝒫 cpw 4551   class class class wbr 5092  dom cdm 5619  ‘cfv 6482  ωcom 7799   ≈ cen 8869   ≼ cdom 8870   ≺ csdm 8871  cardccrd 9831  fBascfbas 21249  Filcfil 23730  UFilcufil 23784

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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-inf2 9537  ax-ac2 10357

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-se 5573  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-isom 6491  df-riota 7306  df-ov 7352  df-oprab 7353  df-mpo 7354  df-rpss 7659  df-om 7800  df-1st 7924  df-2nd 7925  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-1o 8388  df-2o 8389  df-oadd 8392  df-er 8625  df-en 8873  df-dom 8874  df-sdom 8875  df-fin 8876  df-fi 9301  df-oi 9402  df-dju 9797  df-card 9835  df-ac 10010  df-fbas 21258  df-fg 21259  df-fil 23731  df-ufil 23786

This theorem is referenced by: (None)