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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 24221 | . 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 2147 ≠ wne 2959 ∀wral 3080 ∩ cin 4092 ∅c0 4281 𝒫 cpw 4560 ‘cfv 6566 fBascfbas 21717 Filcfil 24219 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fv 6574 df-fil 24220 |
| This theorem is used by: 0nelfil 24223 filsspw 24225 filelss 24226 filin 24228 filtop 24229 snfbas 24240 fgfil 24249 elfilss 24250 filfinnfr 24251 fgabs 24253 filconn 24257 fgtr 24264 trfg 24265 ufilb 24280 ufilmax 24281 isufil2 24282 ssufl 24292 ufileu 24293 filufint 24294 ufilen 24304 fmfg 24323 fmufil 24333 fmid 24334 fmco 24335 ufldom 24336 hausflim 24355 flimrest 24357 flimclslem 24358 flfnei 24365 isflf 24367 flfcnp 24378 fclsrest 24398 fclsfnflim 24401 flimfnfcls 24402 isfcf 24408 cnpfcfi 24414 cnpfcf 24415 cnextcn 24441 cfilufg 24666 neipcfilu 24669 cnextucn 24676 ucnextcn 24677 cfilresi 25671 cfilres 25672 cmetss 25692 relcmpcmet 25694 cfilucfil3 25696 minveclem4a 25806 filnetlem4 37384 |
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