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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 24055 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) ↔ (𝐹 ∈ (fBas‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋((𝐹 ∩ 𝒫 𝑥) ≠ ∅ → 𝑥 ∈ 𝐹))) | |
| 2 | 1 | simplbi 502 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 ≠ wne 2960 ∀wral 3081 ∩ cin 3905 ∅c0 4286 𝒫 cpw 4564 ‘cfv 6540 fBascfbas 21560 Filcfil 24053 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pr 5406 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fv 6548 df-fil 24054 |
| This theorem is used by: 0nelfil 24057 filsspw 24059 filelss 24060 filin 24062 filtop 24063 snfbas 24074 fgfil 24083 elfilss 24084 filfinnfr 24085 fgabs 24087 filconn 24091 fgtr 24098 trfg 24099 ufilb 24114 ufilmax 24115 isufil2 24116 ssufl 24126 ufileu 24127 filufint 24128 ufilen 24138 fmfg 24157 fmufil 24167 fmid 24168 fmco 24169 ufldom 24170 hausflim 24189 flimrest 24191 flimclslem 24192 flfnei 24199 isflf 24201 flfcnp 24212 fclsrest 24232 fclsfnflim 24235 flimfnfcls 24236 isfcf 24242 cnpfcfi 24248 cnpfcf 24249 cnextcn 24275 cfilufg 24500 neipcfilu 24503 cnextucn 24510 ucnextcn 24511 cfilresi 25505 cfilres 25506 cmetss 25526 relcmpcmet 25528 cfilucfil3 25530 minveclem4a 25640 filnetlem4 36949 |
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