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Mirrors > Home > MPE Home > Th. List > filtop | Structured version Visualization version GIF version |
Description: The underlying set belongs to the filter. (Contributed by FL, 20-Jul-2007.) (Revised by Stefan O'Rear, 28-Jul-2015.) |
Ref | Expression |
---|---|
filtop | ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝑋 ∈ 𝐹) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | filfbas 21462 | . . 3 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) | |
2 | fbasne0 21444 | . . 3 ⊢ (𝐹 ∈ (fBas‘𝑋) → 𝐹 ≠ ∅) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ≠ ∅) |
4 | n0 3890 | . . 3 ⊢ (𝐹 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐹) | |
5 | filelss 21466 | . . . . . 6 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹) → 𝑥 ⊆ 𝑋) | |
6 | ssid 3587 | . . . . . . 7 ⊢ 𝑋 ⊆ 𝑋 | |
7 | filss 21467 | . . . . . . . . 9 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ (𝑥 ∈ 𝐹 ∧ 𝑋 ⊆ 𝑋 ∧ 𝑥 ⊆ 𝑋)) → 𝑋 ∈ 𝐹) | |
8 | 7 | 3exp2 1277 | . . . . . . . 8 ⊢ (𝐹 ∈ (Fil‘𝑋) → (𝑥 ∈ 𝐹 → (𝑋 ⊆ 𝑋 → (𝑥 ⊆ 𝑋 → 𝑋 ∈ 𝐹)))) |
9 | 8 | imp 444 | . . . . . . 7 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹) → (𝑋 ⊆ 𝑋 → (𝑥 ⊆ 𝑋 → 𝑋 ∈ 𝐹))) |
10 | 6, 9 | mpi 20 | . . . . . 6 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹) → (𝑥 ⊆ 𝑋 → 𝑋 ∈ 𝐹)) |
11 | 5, 10 | mpd 15 | . . . . 5 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹) → 𝑋 ∈ 𝐹) |
12 | 11 | ex 449 | . . . 4 ⊢ (𝐹 ∈ (Fil‘𝑋) → (𝑥 ∈ 𝐹 → 𝑋 ∈ 𝐹)) |
13 | 12 | exlimdv 1848 | . . 3 ⊢ (𝐹 ∈ (Fil‘𝑋) → (∃𝑥 𝑥 ∈ 𝐹 → 𝑋 ∈ 𝐹)) |
14 | 4, 13 | syl5bi 231 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) → (𝐹 ≠ ∅ → 𝑋 ∈ 𝐹)) |
15 | 3, 14 | mpd 15 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝑋 ∈ 𝐹) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∃wex 1695 ∈ wcel 1977 ≠ wne 2780 ⊆ wss 3540 ∅c0 3874 ‘cfv 5804 fBascfbas 19555 Filcfil 21459 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fv 5812 df-fbas 19564 df-fil 21460 |
This theorem is referenced by: isfil2 21470 filn0 21476 infil 21477 filunibas 21495 filuni 21499 trfil1 21500 trfil2 21501 fgtr 21504 trfg 21505 isufil2 21522 filssufil 21526 ssufl 21532 ufileu 21533 filufint 21534 uffixfr 21537 cfinufil 21542 rnelfmlem 21566 rnelfm 21567 fmfnfmlem1 21568 fmfnfmlem2 21569 fmfnfmlem4 21571 fmfnfm 21572 flfval 21604 fclsfnflim 21641 flimfnfcls 21642 fcfval 21647 alexsublem 21658 metust 22173 cmetss 22921 minveclem4a 23009 filnetlem3 31545 filnetlem4 31546 |
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