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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 23791 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) ↔ (𝐹 ∈ (fBas‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋((𝐹 ∩ 𝒫 𝑥) ≠ ∅ → 𝑥 ∈ 𝐹))) | |
| 2 | 1 | simplbi 497 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2113 ≠ wne 2932 ∀wral 3051 ∩ cin 3900 ∅c0 4285 𝒫 cpw 4554 ‘cfv 6492 fBascfbas 21297 Filcfil 23789 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fv 6500 df-fil 23790 |
| This theorem is referenced by: 0nelfil 23793 filsspw 23795 filelss 23796 filin 23798 filtop 23799 snfbas 23810 fgfil 23819 elfilss 23820 filfinnfr 23821 fgabs 23823 filconn 23827 fgtr 23834 trfg 23835 ufilb 23850 ufilmax 23851 isufil2 23852 ssufl 23862 ufileu 23863 filufint 23864 ufilen 23874 fmfg 23893 fmufil 23903 fmid 23904 fmco 23905 ufldom 23906 hausflim 23925 flimrest 23927 flimclslem 23928 flfnei 23935 isflf 23937 flfcnp 23948 fclsrest 23968 fclsfnflim 23971 flimfnfcls 23972 isfcf 23978 cnpfcfi 23984 cnpfcf 23985 cnextcn 24011 cfilufg 24236 neipcfilu 24239 cnextucn 24246 ucnextcn 24247 cfilresi 25251 cfilres 25252 cmetss 25272 relcmpcmet 25274 cfilucfil3 25276 minveclem4a 25386 filnetlem4 36575 |
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