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Theorem 0nelfil 23703
Description: The empty set doesn't belong to a filter. (Contributed by FL, 20-Jul-2007.) (Revised by Mario Carneiro, 28-Jul-2015.)
Assertion
Ref Expression
0nelfil (𝐹 ∈ (Fil‘𝑋) → ¬ ∅ ∈ 𝐹)

Proof of Theorem 0nelfil
StepHypRef Expression
1 filfbas 23702 . 2 (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋))
2 0nelfb 23685 . 2 (𝐹 ∈ (fBas‘𝑋) → ¬ ∅ ∈ 𝐹)
31, 2syl 17 1 (𝐹 ∈ (Fil‘𝑋) → ¬ ∅ ∈ 𝐹)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wcel 2098  c0 4317  cfv 6536  fBascfbas 21223  Filcfil 23699
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2697  ax-sep 5292  ax-nul 5299  ax-pow 5356  ax-pr 5420
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2528  df-eu 2557  df-clab 2704  df-cleq 2718  df-clel 2804  df-nfc 2879  df-ne 2935  df-nel 3041  df-ral 3056  df-rex 3065  df-rab 3427  df-v 3470  df-sbc 3773  df-csb 3889  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-pw 4599  df-sn 4624  df-pr 4626  df-op 4630  df-uni 4903  df-br 5142  df-opab 5204  df-mpt 5225  df-id 5567  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-res 5681  df-ima 5682  df-iota 6488  df-fun 6538  df-fv 6544  df-fbas 21232  df-fil 23700
This theorem is referenced by:  fileln0  23704  isfil2  23710  infil  23717  filuni  23739  filufint  23774  rnelfmlem  23806  fmfnfm  23812  fclscmpi  23883
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