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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 23972 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) ↔ (𝐹 ∈ (fBas‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋((𝐹 ∩ 𝒫 𝑥) ≠ ∅ → 𝑥 ∈ 𝐹))) | |
| 2 | 1 | simplbi 501 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2149 ≠ wne 2964 ∀wral 3085 ∩ cin 3912 ∅c0 4294 𝒫 cpw 4567 ‘cfv 6537 fBascfbas 21478 Filcfil 23970 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pr 5405 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-mpt 5197 df-id 5557 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-iota 6493 df-fun 6539 df-fv 6545 df-fil 23971 |
| This theorem is referenced by: 0nelfil 23974 filsspw 23976 filelss 23977 filin 23979 filtop 23980 snfbas 23991 fgfil 24000 elfilss 24001 filfinnfr 24002 fgabs 24004 filconn 24008 fgtr 24015 trfg 24016 ufilb 24031 ufilmax 24032 isufil2 24033 ssufl 24043 ufileu 24044 filufint 24045 ufilen 24055 fmfg 24074 fmufil 24084 fmid 24085 fmco 24086 ufldom 24087 hausflim 24106 flimrest 24108 flimclslem 24109 flfnei 24116 isflf 24118 flfcnp 24129 fclsrest 24149 fclsfnflim 24152 flimfnfcls 24153 isfcf 24159 cnpfcfi 24165 cnpfcf 24166 cnextcn 24192 cfilufg 24417 neipcfilu 24420 cnextucn 24427 ucnextcn 24428 cfilresi 25422 cfilres 25423 cmetss 25443 relcmpcmet 25445 cfilucfil3 25447 minveclem4a 25557 filnetlem4 36780 |
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