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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 23812 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) ↔ (𝐹 ∈ (fBas‘𝑋) ∧ ∀𝑥 ∈ 𝒫 𝑋((𝐹 ∩ 𝒫 𝑥) ≠ ∅ → 𝑥 ∈ 𝐹))) | |
| 2 | 1 | simplbi 496 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2932 ∀wral 3051 ∩ cin 3888 ∅c0 4273 𝒫 cpw 4541 ‘cfv 6498 fBascfbas 21340 Filcfil 23810 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 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 3062 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fv 6506 df-fil 23811 |
| This theorem is referenced by: 0nelfil 23814 filsspw 23816 filelss 23817 filin 23819 filtop 23820 snfbas 23831 fgfil 23840 elfilss 23841 filfinnfr 23842 fgabs 23844 filconn 23848 fgtr 23855 trfg 23856 ufilb 23871 ufilmax 23872 isufil2 23873 ssufl 23883 ufileu 23884 filufint 23885 ufilen 23895 fmfg 23914 fmufil 23924 fmid 23925 fmco 23926 ufldom 23927 hausflim 23946 flimrest 23948 flimclslem 23949 flfnei 23956 isflf 23958 flfcnp 23969 fclsrest 23989 fclsfnflim 23992 flimfnfcls 23993 isfcf 23999 cnpfcfi 24005 cnpfcf 24006 cnextcn 24032 cfilufg 24257 neipcfilu 24260 cnextucn 24267 ucnextcn 24268 cfilresi 25262 cfilres 25263 cmetss 25283 relcmpcmet 25285 cfilucfil3 25287 minveclem4a 25397 filnetlem4 36563 |
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