Theorem ufilen 22222

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 8363	. . . . . 6 ⊢ Rel ≼
2	1	brrelex2i 5495	. . . . 5 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ V)
3		numth3 9738	. . . . 5 ⊢ (𝑋 ∈ V → 𝑋 ∈ dom card)
4	2, 3	syl 17	. . . 4 ⊢ (ω ≼ 𝑋 → 𝑋 ∈ dom card)
5		csdfil 22186	. . . 4 ⊢ ((𝑋 ∈ dom card ∧ ω ≼ 𝑋) → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
6	4, 5	mpancom 684	. . 3 ⊢ (ω ≼ 𝑋 → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
7		filssufil 22204	. . 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 6571	. . . . . . 7 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑋 ∈ V)
10	9	ad2antlr 723	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑋 ∈ V)
11		ufilfil 22196	. . . . . . . 8 ⊢ (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (Fil‘𝑋))
12		filelss 22144	. . . . . . . 8 ⊢ ((𝑓 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
13	11, 12	sylan 580	. . . . . . 7 ⊢ ((𝑓 ∈ (UFil‘𝑋) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
14	13	adantll 710	. . . . . 6 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → 𝑥 ⊆ 𝑋)
15		ssdomg 8403	. . . . . 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 22140	. . . . . . . . 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 22131	. . . . . . 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 4014	. . . . . . . . . . . . 13 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → (𝑋 ∖ 𝑦) = (𝑋 ∖ (𝑋 ∖ 𝑥)))
23	22	breq1d 4972	. . . . . . . . . . . 12 ⊢ (𝑦 = (𝑋 ∖ 𝑥) → ((𝑋 ∖ 𝑦) ≺ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋))
24		difss 4029	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∖ 𝑥) ⊆ 𝑋
25		elpw2g 5138	. . . . . . . . . . . . . 14 ⊢ (𝑋 ∈ V → ((𝑋 ∖ 𝑥) ∈ 𝒫 𝑋 ↔ (𝑋 ∖ 𝑥) ⊆ 𝑋))
26	24, 25	mpbiri 259	. . . . . . . . . . . . 13 ⊢ (𝑋 ∈ V → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
27	26	3ad2ant1 1126	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ 𝒫 𝑋)
28		simp2 1130	. . . . . . . . . . . . . 14 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ⊆ 𝑋)
29		dfss4 4155	. . . . . . . . . . . . . 14 ⊢ (𝑥 ⊆ 𝑋 ↔ (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
30	28, 29	sylib 219	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) = 𝑥)
31		simp3 1131	. . . . . . . . . . . . 13 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → 𝑥 ≺ 𝑋)
32	30, 31	eqbrtrd 4984	. . . . . . . . . . . 12 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ (𝑋 ∖ 𝑥)) ≺ 𝑋)
33	23, 27, 32	elrabd 3620	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋 ∧ 𝑥 ≺ 𝑋) → (𝑋 ∖ 𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋})
34		ssel 3883	. . . . . . . . . . 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 1111	. . . . . . . . 9 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ 𝑥 ≺ 𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋 ∖ 𝑥) ∈ 𝑓))
37	36	impancom 452	. . . . . . . 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 452	. . . . . 6 ⊢ (((𝑋 ∈ V ∧ 𝑥 ⊆ 𝑋) ∧ ¬ (𝑋 ∖ 𝑥) ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
40	10, 14, 21, 39	syl21anc 834	. . . . 5 ⊢ (((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥 ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥 ≺ 𝑋))
41		bren2 8388	. . . . . 6 ⊢ (𝑥 ≈ 𝑋 ↔ (𝑥 ≼ 𝑋 ∧ ¬ 𝑥 ≺ 𝑋))
42	41	simplbi2 501	. . . . 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 3156	. . 3 ⊢ ((ω ≼ 𝑋 ∧ 𝑓 ∈ (UFil‘𝑋)) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋 ∖ 𝑦) ≺ 𝑋} ⊆ 𝑓 → ∀𝑥 ∈ 𝑓 𝑥 ≈ 𝑋))
45	44	reximdva 3237	. 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 396   ∧ w3a 1080   = wceq 1522   ∈ wcel 2081  ∀wral 3105  ∃wrex 3106  {crab 3109  Vcvv 3437   ∖ cdif 3856   ⊆ wss 3859  𝒫 cpw 4453   class class class wbr 4962  dom cdm 5443  ‘cfv 6225  ωcom 7436   ≈ cen 8354   ≼ cdom 8355   ≺ csdm 8356  cardccrd 9210  fBascfbas 20215  Filcfil 22137  UFilcufil 22191

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1777  ax-4 1791  ax-5 1888  ax-6 1947  ax-7 1992  ax-8 2083  ax-9 2091  ax-10 2112  ax-11 2126  ax-12 2141  ax-13 2344  ax-ext 2769  ax-rep 5081  ax-sep 5094  ax-nul 5101  ax-pow 5157  ax-pr 5221  ax-un 7319  ax-inf2 8950  ax-ac2 9731

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 843  df-3or 1081  df-3an 1082  df-tru 1525  df-ex 1762  df-nf 1766  df-sb 2043  df-mo 2576  df-eu 2612  df-clab 2776  df-cleq 2788  df-clel 2863  df-nfc 2935  df-ne 2985  df-nel 3091  df-ral 3110  df-rex 3111  df-reu 3112  df-rmo 3113  df-rab 3114  df-v 3439  df-sbc 3707  df-csb 3812  df-dif 3862  df-un 3864  df-in 3866  df-ss 3874  df-pss 3876  df-nul 4212  df-if 4382  df-pw 4455  df-sn 4473  df-pr 4475  df-tp 4477  df-op 4479  df-uni 4746  df-int 4783  df-iun 4827  df-br 4963  df-opab 5025  df-mpt 5042  df-tr 5064  df-id 5348  df-eprel 5353  df-po 5362  df-so 5363  df-fr 5402  df-se 5403  df-we 5404  df-xp 5449  df-rel 5450  df-cnv 5451  df-co 5452  df-dm 5453  df-rn 5454  df-res 5455  df-ima 5456  df-pred 6023  df-ord 6069  df-on 6070  df-lim 6071  df-suc 6072  df-iota 6189  df-fun 6227  df-fn 6228  df-f 6229  df-f1 6230  df-fo 6231  df-f1o 6232  df-fv 6233  df-isom 6234  df-riota 6977  df-ov 7019  df-oprab 7020  df-mpo 7021  df-rpss 7307  df-om 7437  df-1st 7545  df-2nd 7546  df-wrecs 7798  df-recs 7860  df-rdg 7898  df-1o 7953  df-2o 7954  df-oadd 7957  df-er 8139  df-en 8358  df-dom 8359  df-sdom 8360  df-fin 8361  df-fi 8721  df-oi 8820  df-dju 9176  df-card 9214  df-ac 9388  df-fbas 20224  df-fg 20225  df-fil 22138  df-ufil 22193

This theorem is referenced by: (None)