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Theorem ufilb 22035
Description: The complement is in an ultrafilter iff the set is not. (Contributed by Mario Carneiro, 11-Dec-2013.) (Revised by Mario Carneiro, 29-Jul-2015.)
Assertion
Ref Expression
ufilb ((𝐹 ∈ (UFil‘𝑋) ∧ 𝑆𝑋) → (¬ 𝑆𝐹 ↔ (𝑋𝑆) ∈ 𝐹))

Proof of Theorem ufilb
StepHypRef Expression
1 ufilss 22034 . . 3 ((𝐹 ∈ (UFil‘𝑋) ∧ 𝑆𝑋) → (𝑆𝐹 ∨ (𝑋𝑆) ∈ 𝐹))
21ord 891 . 2 ((𝐹 ∈ (UFil‘𝑋) ∧ 𝑆𝑋) → (¬ 𝑆𝐹 → (𝑋𝑆) ∈ 𝐹))
3 ufilfil 22033 . . . 4 (𝐹 ∈ (UFil‘𝑋) → 𝐹 ∈ (Fil‘𝑋))
4 filfbas 21977 . . . 4 (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋))
5 fbncp 21968 . . . . . 6 ((𝐹 ∈ (fBas‘𝑋) ∧ 𝑆𝐹) → ¬ (𝑋𝑆) ∈ 𝐹)
65ex 402 . . . . 5 (𝐹 ∈ (fBas‘𝑋) → (𝑆𝐹 → ¬ (𝑋𝑆) ∈ 𝐹))
76con2d 132 . . . 4 (𝐹 ∈ (fBas‘𝑋) → ((𝑋𝑆) ∈ 𝐹 → ¬ 𝑆𝐹))
83, 4, 73syl 18 . . 3 (𝐹 ∈ (UFil‘𝑋) → ((𝑋𝑆) ∈ 𝐹 → ¬ 𝑆𝐹))
98adantr 473 . 2 ((𝐹 ∈ (UFil‘𝑋) ∧ 𝑆𝑋) → ((𝑋𝑆) ∈ 𝐹 → ¬ 𝑆𝐹))
102, 9impbid 204 1 ((𝐹 ∈ (UFil‘𝑋) ∧ 𝑆𝑋) → (¬ 𝑆𝐹 ↔ (𝑋𝑆) ∈ 𝐹))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 198  wa 385  wcel 2157  cdif 3764  wss 3767  cfv 6099  fBascfbas 20053  Filcfil 21974  UFilcufil 22028
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2354  ax-ext 2775  ax-sep 4973  ax-nul 4981  ax-pow 5033  ax-pr 5095
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2590  df-eu 2607  df-clab 2784  df-cleq 2790  df-clel 2793  df-nfc 2928  df-ne 2970  df-nel 3073  df-ral 3092  df-rex 3093  df-rab 3096  df-v 3385  df-sbc 3632  df-csb 3727  df-dif 3770  df-un 3772  df-in 3774  df-ss 3781  df-nul 4114  df-if 4276  df-pw 4349  df-sn 4367  df-pr 4369  df-op 4373  df-uni 4627  df-br 4842  df-opab 4904  df-mpt 4921  df-id 5218  df-xp 5316  df-rel 5317  df-cnv 5318  df-co 5319  df-dm 5320  df-rn 5321  df-res 5322  df-ima 5323  df-iota 6062  df-fun 6101  df-fv 6107  df-fbas 20062  df-fil 21975  df-ufil 22030
This theorem is referenced by:  ufilmax  22036  ufprim  22038  trufil  22039  ufileu  22048  cfinufil  22057  alexsublem  22173
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