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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 23803 | . 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 3902 ∅c0 4287 𝒫 cpw 4556 ‘cfv 6500 fBascfbas 21309 Filcfil 23801 |
| 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 5243 ax-nul 5253 ax-pr 5379 |
| 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 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-iota 6456 df-fun 6502 df-fv 6508 df-fil 23802 |
| This theorem is referenced by: 0nelfil 23805 filsspw 23807 filelss 23808 filin 23810 filtop 23811 snfbas 23822 fgfil 23831 elfilss 23832 filfinnfr 23833 fgabs 23835 filconn 23839 fgtr 23846 trfg 23847 ufilb 23862 ufilmax 23863 isufil2 23864 ssufl 23874 ufileu 23875 filufint 23876 ufilen 23886 fmfg 23905 fmufil 23915 fmid 23916 fmco 23917 ufldom 23918 hausflim 23937 flimrest 23939 flimclslem 23940 flfnei 23947 isflf 23949 flfcnp 23960 fclsrest 23980 fclsfnflim 23983 flimfnfcls 23984 isfcf 23990 cnpfcfi 23996 cnpfcf 23997 cnextcn 24023 cfilufg 24248 neipcfilu 24251 cnextucn 24258 ucnextcn 24259 cfilresi 25263 cfilres 25264 cmetss 25284 relcmpcmet 25286 cfilucfil3 25288 minveclem4a 25398 filnetlem4 36597 |
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