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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 24004 | . 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 2143 ≠ wne 2958 ∀wral 3079 ∩ cin 3904 ∅c0 4286 𝒫 cpw 4562 ‘cfv 6536 fBascfbas 21510 Filcfil 24002 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pr 5404 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-iota 6492 df-fun 6538 df-fv 6544 df-fil 24003 |
| This theorem is referenced by: 0nelfil 24006 filsspw 24008 filelss 24009 filin 24011 filtop 24012 snfbas 24023 fgfil 24032 elfilss 24033 filfinnfr 24034 fgabs 24036 filconn 24040 fgtr 24047 trfg 24048 ufilb 24063 ufilmax 24064 isufil2 24065 ssufl 24075 ufileu 24076 filufint 24077 ufilen 24087 fmfg 24106 fmufil 24116 fmid 24117 fmco 24118 ufldom 24119 hausflim 24138 flimrest 24140 flimclslem 24141 flfnei 24148 isflf 24150 flfcnp 24161 fclsrest 24181 fclsfnflim 24184 flimfnfcls 24185 isfcf 24191 cnpfcfi 24197 cnpfcf 24198 cnextcn 24224 cfilufg 24449 neipcfilu 24452 cnextucn 24459 ucnextcn 24460 cfilresi 25454 cfilres 25455 cmetss 25475 relcmpcmet 25477 cfilucfil3 25479 minveclem4a 25589 filnetlem4 36892 |
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