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Theorem ufilen 23069
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)∀𝑥𝑓 𝑥𝑋)
Distinct variable group:   𝑥,𝑓,𝑋

Proof of Theorem ufilen
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 reldom 8727 . . . . . 6 Rel ≼
21brrelex2i 5640 . . . . 5 (ω ≼ 𝑋𝑋 ∈ V)
3 numth3 10214 . . . . 5 (𝑋 ∈ V → 𝑋 ∈ dom card)
42, 3syl 17 . . . 4 (ω ≼ 𝑋𝑋 ∈ dom card)
5 csdfil 23033 . . . 4 ((𝑋 ∈ dom card ∧ ω ≼ 𝑋) → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
64, 5mpancom 685 . . 3 (ω ≼ 𝑋 → {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ∈ (Fil‘𝑋))
7 filssufil 23051 . . 3 ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ∈ (Fil‘𝑋) → ∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓)
86, 7syl 17 . 2 (ω ≼ 𝑋 → ∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓)
9 elfvex 6800 . . . . . . 7 (𝑓 ∈ (UFil‘𝑋) → 𝑋 ∈ V)
109ad2antlr 724 . . . . . 6 (((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥𝑓) → 𝑋 ∈ V)
11 ufilfil 23043 . . . . . . . 8 (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (Fil‘𝑋))
12 filelss 22991 . . . . . . . 8 ((𝑓 ∈ (Fil‘𝑋) ∧ 𝑥𝑓) → 𝑥𝑋)
1311, 12sylan 580 . . . . . . 7 ((𝑓 ∈ (UFil‘𝑋) ∧ 𝑥𝑓) → 𝑥𝑋)
1413adantll 711 . . . . . 6 (((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥𝑓) → 𝑥𝑋)
15 ssdomg 8774 . . . . . 6 (𝑋 ∈ V → (𝑥𝑋𝑥𝑋))
1610, 14, 15sylc 65 . . . . 5 (((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥𝑓) → 𝑥𝑋)
17 filfbas 22987 . . . . . . . . 9 (𝑓 ∈ (Fil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
1811, 17syl 17 . . . . . . . 8 (𝑓 ∈ (UFil‘𝑋) → 𝑓 ∈ (fBas‘𝑋))
1918adantl 482 . . . . . . 7 ((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) → 𝑓 ∈ (fBas‘𝑋))
20 fbncp 22978 . . . . . . 7 ((𝑓 ∈ (fBas‘𝑋) ∧ 𝑥𝑓) → ¬ (𝑋𝑥) ∈ 𝑓)
2119, 20sylan 580 . . . . . 6 (((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥𝑓) → ¬ (𝑋𝑥) ∈ 𝑓)
22 difeq2 4051 . . . . . . . . . . . . 13 (𝑦 = (𝑋𝑥) → (𝑋𝑦) = (𝑋 ∖ (𝑋𝑥)))
2322breq1d 5084 . . . . . . . . . . . 12 (𝑦 = (𝑋𝑥) → ((𝑋𝑦) ≺ 𝑋 ↔ (𝑋 ∖ (𝑋𝑥)) ≺ 𝑋))
24 difss 4066 . . . . . . . . . . . . . 14 (𝑋𝑥) ⊆ 𝑋
25 elpw2g 5267 . . . . . . . . . . . . . 14 (𝑋 ∈ V → ((𝑋𝑥) ∈ 𝒫 𝑋 ↔ (𝑋𝑥) ⊆ 𝑋))
2624, 25mpbiri 257 . . . . . . . . . . . . 13 (𝑋 ∈ V → (𝑋𝑥) ∈ 𝒫 𝑋)
27263ad2ant1 1132 . . . . . . . . . . . 12 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → (𝑋𝑥) ∈ 𝒫 𝑋)
28 simp2 1136 . . . . . . . . . . . . . 14 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → 𝑥𝑋)
29 dfss4 4193 . . . . . . . . . . . . . 14 (𝑥𝑋 ↔ (𝑋 ∖ (𝑋𝑥)) = 𝑥)
3028, 29sylib 217 . . . . . . . . . . . . 13 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → (𝑋 ∖ (𝑋𝑥)) = 𝑥)
31 simp3 1137 . . . . . . . . . . . . 13 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → 𝑥𝑋)
3230, 31eqbrtrd 5096 . . . . . . . . . . . 12 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → (𝑋 ∖ (𝑋𝑥)) ≺ 𝑋)
3323, 27, 32elrabd 3626 . . . . . . . . . . 11 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → (𝑋𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋})
34 ssel 3914 . . . . . . . . . . 11 ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → ((𝑋𝑥) ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} → (𝑋𝑥) ∈ 𝑓))
3533, 34syl5com 31 . . . . . . . . . 10 ((𝑋 ∈ V ∧ 𝑥𝑋𝑥𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋𝑥) ∈ 𝑓))
36353expa 1117 . . . . . . . . 9 (((𝑋 ∈ V ∧ 𝑥𝑋) ∧ 𝑥𝑋) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → (𝑋𝑥) ∈ 𝑓))
3736impancom 452 . . . . . . . 8 (((𝑋 ∈ V ∧ 𝑥𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓) → (𝑥𝑋 → (𝑋𝑥) ∈ 𝑓))
3837con3d 152 . . . . . . 7 (((𝑋 ∈ V ∧ 𝑥𝑋) ∧ {𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓) → (¬ (𝑋𝑥) ∈ 𝑓 → ¬ 𝑥𝑋))
3938impancom 452 . . . . . 6 (((𝑋 ∈ V ∧ 𝑥𝑋) ∧ ¬ (𝑋𝑥) ∈ 𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥𝑋))
4010, 14, 21, 39syl21anc 835 . . . . 5 (((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → ¬ 𝑥𝑋))
41 bren2 8759 . . . . . 6 (𝑥𝑋 ↔ (𝑥𝑋 ∧ ¬ 𝑥𝑋))
4241simplbi2 501 . . . . 5 (𝑥𝑋 → (¬ 𝑥𝑋𝑥𝑋))
4316, 40, 42sylsyld 61 . . . 4 (((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) ∧ 𝑥𝑓) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓𝑥𝑋))
4443ralrimdva 3118 . . 3 ((ω ≼ 𝑋𝑓 ∈ (UFil‘𝑋)) → ({𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → ∀𝑥𝑓 𝑥𝑋))
4544reximdva 3201 . 2 (ω ≼ 𝑋 → (∃𝑓 ∈ (UFil‘𝑋){𝑦 ∈ 𝒫 𝑋 ∣ (𝑋𝑦) ≺ 𝑋} ⊆ 𝑓 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥𝑓 𝑥𝑋))
468, 45mpd 15 1 (ω ≼ 𝑋 → ∃𝑓 ∈ (UFil‘𝑋)∀𝑥𝑓 𝑥𝑋)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 396  w3a 1086   = wceq 1539  wcel 2106  wral 3064  wrex 3065  {crab 3068  Vcvv 3430  cdif 3884  wss 3887  𝒫 cpw 4534   class class class wbr 5074  dom cdm 5585  cfv 6427  ωcom 7703  cen 8718  cdom 8719  csdm 8720  cardccrd 9681  fBascfbas 20573  Filcfil 22984  UFilcufil 23038
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5222  ax-nul 5229  ax-pow 5287  ax-pr 5351  ax-un 7579  ax-inf2 9387  ax-ac2 10207
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-nel 3050  df-ral 3069  df-rex 3070  df-reu 3071  df-rmo 3072  df-rab 3073  df-v 3432  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4258  df-if 4461  df-pw 4536  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4841  df-int 4881  df-iun 4927  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5485  df-eprel 5491  df-po 5499  df-so 5500  df-fr 5540  df-se 5541  df-we 5542  df-xp 5591  df-rel 5592  df-cnv 5593  df-co 5594  df-dm 5595  df-rn 5596  df-res 5597  df-ima 5598  df-pred 6196  df-ord 6263  df-on 6264  df-lim 6265  df-suc 6266  df-iota 6385  df-fun 6429  df-fn 6430  df-f 6431  df-f1 6432  df-fo 6433  df-f1o 6434  df-fv 6435  df-isom 6436  df-riota 7225  df-ov 7271  df-oprab 7272  df-mpo 7273  df-rpss 7567  df-om 7704  df-1st 7821  df-2nd 7822  df-frecs 8085  df-wrecs 8116  df-recs 8190  df-rdg 8229  df-1o 8285  df-2o 8286  df-oadd 8289  df-er 8486  df-en 8722  df-dom 8723  df-sdom 8724  df-fin 8725  df-fi 9158  df-oi 9257  df-dju 9647  df-card 9685  df-ac 9860  df-fbas 20582  df-fg 20583  df-fil 22985  df-ufil 23040
This theorem is referenced by: (None)
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