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Theorem filunibas 24017
Description: Recover the base set from a filter. (Contributed by Stefan O'Rear, 2-Aug-2015.)
Assertion
Ref Expression
filunibas (𝐹 ∈ (Fil‘𝑋) → 𝐹 = 𝑋)

Proof of Theorem filunibas
StepHypRef Expression
1 filsspw 23987 . . 3 (𝐹 ∈ (Fil‘𝑋) → 𝐹 ⊆ 𝒫 𝑋)
2 sspwuni 5065 . . 3 (𝐹 ⊆ 𝒫 𝑋 𝐹𝑋)
31, 2sylib 221 . 2 (𝐹 ∈ (Fil‘𝑋) → 𝐹𝑋)
4 filtop 23991 . 2 (𝐹 ∈ (Fil‘𝑋) → 𝑋𝐹)
5 unissel 4904 . 2 (( 𝐹𝑋𝑋𝐹) → 𝐹 = 𝑋)
63, 4, 5syl2anc 595 1 (𝐹 ∈ (Fil‘𝑋) → 𝐹 = 𝑋)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1568  wcel 2141  wss 3904  𝒫 cpw 4561   cuni 4871  cfv 6536  Filcfil 23981
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5256  ax-nul 5268  ax-pow 5336  ax-pr 5404
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-nf 1812  df-sb 2095  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-nel 3063  df-ral 3078  df-rex 3088  df-rab 3415  df-v 3455  df-sbc 3744  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4487  df-pw 4563  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-br 5109  df-opab 5173  df-mpt 5192  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-iota 6492  df-fun 6538  df-fv 6544  df-fbas 21498  df-fil 23982
This theorem is referenced by:  filunirn  24018  filconn  24019  uffixfr  24059  uffix2  24060  uffixsn  24061  ufildr  24067  flimtopon  24106  flimss1  24109  flffval  24125  fclsval  24144  isfcls  24145  fclstopon  24148  fclsfnflim  24163  fcfval  24169
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