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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 24073 | . 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 2145 ≠ wne 2955 ∀wral 3076 ∩ cin 3898 ∅c0 4279 𝒫 cpw 4557 ‘cfv 6533 fBascfbas 21573 Filcfil 24071 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6489 df-fun 6535 df-fv 6541 df-fil 24072 |
| This theorem is used by: 0nelfil 24075 filsspw 24077 filelss 24078 filin 24080 filtop 24081 snfbas 24092 fgfil 24101 elfilss 24102 filfinnfr 24103 fgabs 24105 filconn 24109 fgtr 24116 trfg 24117 ufilb 24132 ufilmax 24133 isufil2 24134 ssufl 24144 ufileu 24145 filufint 24146 ufilen 24156 fmfg 24175 fmufil 24185 fmid 24186 fmco 24187 ufldom 24188 hausflim 24207 flimrest 24209 flimclslem 24210 flfnei 24217 isflf 24219 flfcnp 24230 fclsrest 24250 fclsfnflim 24253 flimfnfcls 24254 isfcf 24260 cnpfcfi 24266 cnpfcf 24267 cnextcn 24293 cfilufg 24518 neipcfilu 24521 cnextucn 24528 ucnextcn 24529 cfilresi 25523 cfilres 25524 cmetss 25544 relcmpcmet 25546 cfilucfil3 25548 minveclem4a 25658 filnetlem4 37000 |
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