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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 21674 | . . 3 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝑋filGen𝐹) = {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅}) | |
2 | 1 | eleq2d 2687 | . 2 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ (𝑋filGen𝐹) ↔ 𝐴 ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅})) |
3 | pweq 4161 | . . . . . 6 ⊢ (𝑦 = 𝐴 → 𝒫 𝑦 = 𝒫 𝐴) | |
4 | 3 | ineq2d 3814 | . . . . 5 ⊢ (𝑦 = 𝐴 → (𝐹 ∩ 𝒫 𝑦) = (𝐹 ∩ 𝒫 𝐴)) |
5 | 4 | neeq1d 2853 | . . . 4 ⊢ (𝑦 = 𝐴 → ((𝐹 ∩ 𝒫 𝑦) ≠ ∅ ↔ (𝐹 ∩ 𝒫 𝐴) ≠ ∅)) |
6 | 5 | elrab 3363 | . . 3 ⊢ (𝐴 ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅} ↔ (𝐴 ∈ 𝒫 𝑋 ∧ (𝐹 ∩ 𝒫 𝐴) ≠ ∅)) |
7 | elfvdm 6220 | . . . . 5 ⊢ (𝐹 ∈ (fBas‘𝑋) → 𝑋 ∈ dom fBas) | |
8 | elpw2g 4827 | . . . . 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 3796 | . . . . . . . 8 ⊢ (𝑥 ∈ (𝐹 ∩ 𝒫 𝐴) ↔ (𝑥 ∈ 𝐹 ∧ 𝑥 ∈ 𝒫 𝐴)) | |
11 | selpw 4165 | . . . . . . . . 9 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴) | |
12 | 11 | anbi2i 730 | . . . . . . . 8 ⊢ ((𝑥 ∈ 𝐹 ∧ 𝑥 ∈ 𝒫 𝐴) ↔ (𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) |
13 | 10, 12 | bitri 264 | . . . . . . 7 ⊢ (𝑥 ∈ (𝐹 ∩ 𝒫 𝐴) ↔ (𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) |
14 | 13 | exbii 1774 | . . . . . 6 ⊢ (∃𝑥 𝑥 ∈ (𝐹 ∩ 𝒫 𝐴) ↔ ∃𝑥(𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) |
15 | n0 3931 | . . . . . 6 ⊢ ((𝐹 ∩ 𝒫 𝐴) ≠ ∅ ↔ ∃𝑥 𝑥 ∈ (𝐹 ∩ 𝒫 𝐴)) | |
16 | df-rex 2918 | . . . . . 6 ⊢ (∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴 ↔ ∃𝑥(𝑥 ∈ 𝐹 ∧ 𝑥 ⊆ 𝐴)) | |
17 | 14, 15, 16 | 3bitr4i 292 | . . . . 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 747 | . . 3 ⊢ (𝐹 ∈ (fBas‘𝑋) → ((𝐴 ∈ 𝒫 𝑋 ∧ (𝐹 ∩ 𝒫 𝐴) ≠ ∅) ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
20 | 6, 19 | syl5bb 272 | . 2 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ {𝑦 ∈ 𝒫 𝑋 ∣ (𝐹 ∩ 𝒫 𝑦) ≠ ∅} ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
21 | 2, 20 | bitrd 268 | 1 ⊢ (𝐹 ∈ (fBas‘𝑋) → (𝐴 ∈ (𝑋filGen𝐹) ↔ (𝐴 ⊆ 𝑋 ∧ ∃𝑥 ∈ 𝐹 𝑥 ⊆ 𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 = wceq 1483 ∃wex 1704 ∈ wcel 1990 ≠ wne 2794 ∃wrex 2913 {crab 2916 ∩ cin 3573 ⊆ wss 3574 ∅c0 3915 𝒫 cpw 4158 dom cdm 5114 ‘cfv 5888 (class class class)co 6650 fBascfbas 19734 filGencfg 19735 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-iota 5851 df-fun 5890 df-fv 5896 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-fg 19744 |
This theorem is referenced by: ssfg 21676 fgss 21677 fgss2 21678 fgfil 21679 elfilss 21680 fgcl 21682 fgabs 21683 fgtr 21694 trfg 21695 uffix 21725 elfm 21751 elfm2 21752 elfm3 21754 fbflim 21780 flffbas 21799 fclsbas 21825 isucn2 22083 metust 22363 cfilucfil 22364 metuel 22369 fgcfil 23069 fgmin 32365 filnetlem4 32376 |
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