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| Mirrors > Home > MPE Home > Th. List > filfbas | Structured version Visualization version GIF version | ||
| Description: A filter is a filter base. (Contributed by Jeff Hankins, 2-Sep-2009.) (Revised by Mario Carneiro, 28-Jul-2015.) |
| Ref | Expression |
|---|---|
| filfbas | ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | isfil 23830 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) ↔ (𝐹 ∈ (fBas‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋((𝐹 ∩ 𝒫 𝑥) ≠ ∅ → 𝑥 ∈ 𝐹))) | |
| 2 | 1 | simplbi 497 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2119 ≠ wne 2934 ∀wral 3053 ∩ cin 3882 ∅c0 4261 𝒫 cpw 4529 ‘cfv 6485 fBascfbas 21335 Filcfil 23828 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pr 5362 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-iota 6441 df-fun 6487 df-fv 6493 df-fil 23829 |
| This theorem is referenced by: 0nelfil 23832 filsspw 23834 filelss 23835 filin 23837 filtop 23838 snfbas 23849 fgfil 23858 elfilss 23859 filfinnfr 23860 fgabs 23862 filconn 23866 fgtr 23873 trfg 23874 ufilb 23889 ufilmax 23890 isufil2 23891 ssufl 23901 ufileu 23902 filufint 23903 ufilen 23913 fmfg 23932 fmufil 23942 fmid 23943 fmco 23944 ufldom 23945 hausflim 23964 flimrest 23966 flimclslem 23967 flfnei 23974 isflf 23976 flfcnp 23987 fclsrest 24007 fclsfnflim 24010 flimfnfcls 24011 isfcf 24017 cnpfcfi 24023 cnpfcf 24024 cnextcn 24050 cfilufg 24275 neipcfilu 24278 cnextucn 24285 ucnextcn 24286 cfilresi 25280 cfilres 25281 cmetss 25301 relcmpcmet 25303 cfilucfil3 25305 minveclem4a 25415 filnetlem4 36609 |
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