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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 24159 | . 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 2956 ∀wral 3077 ∩ cin 3898 ∅c0 4279 𝒫 cpw 4557 ‘cfv 6537 fBascfbas 21659 Filcfil 24157 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 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 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6493 df-fun 6539 df-fv 6545 df-fil 24158 |
| This theorem is used by: 0nelfil 24161 filsspw 24163 filelss 24164 filin 24166 filtop 24167 snfbas 24178 fgfil 24187 elfilss 24188 filfinnfr 24189 fgabs 24191 filconn 24195 fgtr 24202 trfg 24203 ufilb 24218 ufilmax 24219 isufil2 24220 ssufl 24230 ufileu 24231 filufint 24232 ufilen 24242 fmfg 24261 fmufil 24271 fmid 24272 fmco 24273 ufldom 24274 hausflim 24293 flimrest 24295 flimclslem 24296 flfnei 24303 isflf 24305 flfcnp 24316 fclsrest 24336 fclsfnflim 24339 flimfnfcls 24340 isfcf 24346 cnpfcfi 24352 cnpfcf 24353 cnextcn 24379 cfilufg 24604 neipcfilu 24607 cnextucn 24614 ucnextcn 24615 cfilresi 25609 cfilres 25610 cmetss 25630 relcmpcmet 25632 cfilucfil3 25634 minveclem4a 25744 filnetlem4 37149 |
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