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Mirrors > Home > MPE Home > Th. List > elfg | Structured version Visualization version GIF version |
Description: A condition for elements of a generated filter. (Contributed by Jeff Hankins, 3-Sep-2009.) (Revised by Stefan O'Rear, 2-Aug-2015.) |
Ref | Expression |
---|---|
elfg | ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ (𝑋filGen𝐹) ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fgval 22929 | . . 3 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝑋filGen𝐹) = {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅}) | |
2 | 1 | eleq2d 2824 | . 2 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ (𝑋filGen𝐹) ↔ 𝐴 ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅})) |
3 | pweq 4546 | . . . . . 6 ⊢ (𝑦 = 𝐴 → 𝒫 𝑦 = 𝒫 𝐴) | |
4 | 3 | ineq2d 4143 | . . . . 5 ⊢ (𝑦 = 𝐴 → (𝐹 ∩ 𝒫 𝑦) = (𝐹 ∩ 𝒫 𝐴)) |
5 | 4 | neeq1d 3002 | . . . 4 ⊢ (𝑦 = 𝐴 → ((𝐹 ∩ 𝒫 𝑦) ≠ ∅ ↔ (𝐹 ∩ 𝒫 𝐴) ≠ ∅)) |
6 | 5 | elrab 3617 | . . 3 ⊢ (𝐴 ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅} ↔ (𝐴 ∈ 𝒫 𝑋 ∧ (𝐹 ∩ 𝒫 𝐴) ≠ ∅)) |
7 | elfvdm 6788 | . . . . 5 ⊢ (𝐹 ∈ (fBas‘𝑋) → 𝑋 ∈ dom fBas) | |
8 | elpw2g 5263 | . . . . 5 ⊢ (𝑋 ∈ dom fBas → (𝐴 ∈ 𝒫 𝑋 ↔ 𝐴 ⊆ 𝑋)) | |
9 | 7, 8 | syl 17 | . . . 4 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ 𝒫 𝑋 ↔ 𝐴 ⊆ 𝑋)) |
10 | elin 3899 | . . . . . . . 8 ⊢ (𝑥 ∈ (𝐹 ∩ 𝒫 𝐴) ↔ (𝑥 ∈ 𝐹 ∧ 𝑥 ∈ 𝒫 𝐴)) | |
11 | velpw 4535 | . . . . . . . . 9 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴) | |
12 | 11 | anbi2i 622 | . . . . . . . 8 ⊢ ((𝑥 ∈ 𝐹 ∧ 𝑥 ∈ 𝒫 𝐴) ↔ (𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) |
13 | 10, 12 | bitri 274 | . . . . . . 7 ⊢ (𝑥 ∈ (𝐹 ∩ 𝒫 𝐴) ↔ (𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) |
14 | 13 | exbii 1851 | . . . . . 6 ⊢ (∃𝑥 𝑥 ∈ (𝐹 ∩ 𝒫 𝐴) ↔ ∃𝑥(𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) |
15 | n0 4277 | . . . . . 6 ⊢ ((𝐹 ∩ 𝒫 𝐴) ≠ ∅ ↔ ∃𝑥 𝑥 ∈ (𝐹 ∩ 𝒫 𝐴)) | |
16 | df-rex 3069 | . . . . . 6 ⊢ (∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴 ↔ ∃𝑥(𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) | |
17 | 14, 15, 16 | 3bitr4i 302 | . . . . 5 ⊢ ((𝐹 ∩ 𝒫 𝐴) ≠ ∅ ↔ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴) |
18 | 17 | a1i 11 | . . . 4 ⊢ (𝐹 ∈ (fBas‘𝑋) → ((𝐹 ∩ 𝒫 𝐴) ≠ ∅ ↔ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴)) |
19 | 9, 18 | anbi12d 630 | . . 3 ⊢ (𝐹 ∈ (fBas‘𝑋) → ((𝐴 ∈ 𝒫 𝑋 ∧ (𝐹 ∩ 𝒫 𝐴) ≠ ∅) ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
20 | 6, 19 | syl5bb 282 | . 2 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅} ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
21 | 2, 20 | bitrd 278 | 1 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ (𝑋filGen𝐹) ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1539 ∃wex 1783 ∈ wcel 2108 ≠ wne 2942 ∃wrex 3064 {crab 3067 ∩ cin 3882 ⊆ wss 3883 ∅c0 4253 𝒫 cpw 4530 dom cdm 5580 ‘cfv 6418 (class class class)co 7255 fBascfbas 20498 filGencfg 20499 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-sbc 3712 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-id 5480 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-iota 6376 df-fun 6420 df-fv 6426 df-ov 7258 df-oprab 7259 df-mpo 7260 df-fg 20508 |
This theorem is referenced by: ssfg 22931 fgss 22932 fgss2 22933 fgfil 22934 elfilss 22935 fgcl 22937 fgabs 22938 fgtr 22949 trfg 22950 uffix 22980 elfm 23006 elfm2 23007 elfm3 23009 fbflim 23035 flffbas 23054 fclsbas 23080 isucn2 23339 metust 23620 cfilucfil 23621 metuel 23626 fgcfil 24340 fgmin 34486 filnetlem4 34497 |
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