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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 23822 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) ↔ (𝐹 ∈ (fBas‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋((𝐹 ∩ 𝒫 𝑥) ≠ ∅ → 𝑥 ∈ 𝐹))) | |
| 2 | 1 | simplbi 496 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2933 ∀wral 3052 ∩ cin 3889 ∅c0 4274 𝒫 cpw 4542 ‘cfv 6492 fBascfbas 21332 Filcfil 23820 |
| 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 5231 ax-nul 5241 ax-pr 5370 |
| 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 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fv 6500 df-fil 23821 |
| This theorem is referenced by: 0nelfil 23824 filsspw 23826 filelss 23827 filin 23829 filtop 23830 snfbas 23841 fgfil 23850 elfilss 23851 filfinnfr 23852 fgabs 23854 filconn 23858 fgtr 23865 trfg 23866 ufilb 23881 ufilmax 23882 isufil2 23883 ssufl 23893 ufileu 23894 filufint 23895 ufilen 23905 fmfg 23924 fmufil 23934 fmid 23935 fmco 23936 ufldom 23937 hausflim 23956 flimrest 23958 flimclslem 23959 flfnei 23966 isflf 23968 flfcnp 23979 fclsrest 23999 fclsfnflim 24002 flimfnfcls 24003 isfcf 24009 cnpfcfi 24015 cnpfcf 24016 cnextcn 24042 cfilufg 24267 neipcfilu 24270 cnextucn 24277 ucnextcn 24278 cfilresi 25272 cfilres 25273 cmetss 25293 relcmpcmet 25295 cfilucfil3 25297 minveclem4a 25407 filnetlem4 36579 |
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