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Theorem ufilfil 23860
Description: An ultrafilter is a filter. (Contributed by Jeff Hankins, 1-Dec-2009.) (Revised by Mario Carneiro, 29-Jul-2015.)
Assertion
Ref Expression
ufilfil (𝐹 ∈ (UFil‘𝑋) → 𝐹 ∈ (Fil‘𝑋))

Proof of Theorem ufilfil
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 isufil 23859 . 2 (𝐹 ∈ (UFil‘𝑋) ↔ (𝐹 ∈ (Fil‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋(𝑥𝐹 ∨ (𝑋𝑥) ∈ 𝐹)))
21simplbi 496 1 (𝐹 ∈ (UFil‘𝑋) → 𝐹 ∈ (Fil‘𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 848  wcel 2114  wral 3052  cdif 3900  𝒫 cpw 4556  cfv 6500  Filcfil 23801  UFilcufil 23855
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5243  ax-nul 5253  ax-pr 5379
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fv 6508  df-ufil 23857
This theorem is referenced by:  ufilb  23862  isufil2  23864  ufprim  23865  trufil  23866  ufileu  23875  filufint  23876  uffixfr  23879  uffix2  23880  uffixsn  23881  uffinfix  23883  cfinufil  23884  ufilen  23886  ufildr  23887  fmufil  23915  ufldom  23918  uffclsflim  23987  ufilcmp  23988  uffcfflf  23995  alexsublem  24000
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