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Theorem fileln0 21654
Description: An element of a filter is nonempty. (Contributed by FL, 24-May-2011.) (Revised by Mario Carneiro, 28-Jul-2015.)
Assertion
Ref Expression
fileln0  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  A  =/=  (/) )

Proof of Theorem fileln0
StepHypRef Expression
1 id 22 . 2  |-  ( A  e.  F  ->  A  e.  F )
2 0nelfil 21653 . 2  |-  ( F  e.  ( Fil `  X
)  ->  -.  (/)  e.  F
)
3 nelne2 2891 . 2  |-  ( ( A  e.  F  /\  -.  (/)  e.  F )  ->  A  =/=  (/) )
41, 2, 3syl2anr 495 1  |-  ( ( F  e.  ( Fil `  X )  /\  A  e.  F )  ->  A  =/=  (/) )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 384    e. wcel 1990    =/= wne 2794   (/)c0 3915   ` cfv 5888   Filcfil 21649
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fv 5896  df-fbas 19743  df-fil 21650
This theorem is referenced by:  filinn0  21664  filintn0  21665  alexsublem  21848  cfil3i  23067  iscmet3  23091  filnetlem4  32376
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