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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 22699 | . . 3 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋)) | |
2 | fbasne0 22681 | . . 3 ⊢ (𝐹 ∈ (fBas‘𝑋) → 𝐹 ≠ ∅) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ≠ ∅) |
4 | n0 4247 | . . 3 ⊢ (𝐹 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐹) | |
5 | filelss 22703 | . . . . . 6 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑥 ∈ 𝐹) → 𝑥 ⊆ 𝑋) | |
6 | ssid 3909 | . . . . . . 7 ⊢ 𝑋 ⊆ 𝑋 | |
7 | filss 22704 | . . . . . . . . 9 ⊢ ((𝐹 ∈ (Fil‘𝑋) ∧ (𝑥 ∈ 𝐹 ∧ 𝑋 ⊆ 𝑋 ∧ 𝑥 ⊆ 𝑋)) → 𝑋 ∈ 𝐹) | |
8 | 7 | 3exp2 1356 | . . . . . . . 8 ⊢ (𝐹 ∈ (Fil‘𝑋) → (𝑥 ∈ 𝐹 → (𝑋 ⊆ 𝑋 → (𝑥 ⊆ 𝑋 → 𝑋 ∈ 𝐹)))) |
9 | 8 | imp 410 | . . . . . . 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 416 | . . . 4 ⊢ (𝐹 ∈ (Fil‘𝑋) → (𝑥 ∈ 𝐹 → 𝑋 ∈ 𝐹)) |
13 | 12 | exlimdv 1941 | . . 3 ⊢ (𝐹 ∈ (Fil‘𝑋) → (∃𝑥 𝑥 ∈ 𝐹 → 𝑋 ∈ 𝐹)) |
14 | 4, 13 | syl5bi 245 | . 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 399 ∃wex 1787 ∈ wcel 2112 ≠ wne 2932 ⊆ wss 3853 ∅c0 4223 ‘cfv 6358 fBascfbas 20305 Filcfil 22696 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-br 5040 df-opab 5102 df-mpt 5121 df-id 5440 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-iota 6316 df-fun 6360 df-fv 6366 df-fbas 20314 df-fil 22697 |
This theorem is referenced by: isfil2 22707 filn0 22713 infil 22714 filunibas 22732 filuni 22736 trfil1 22737 trfil2 22738 fgtr 22741 trfg 22742 isufil2 22759 filssufil 22763 ssufl 22769 ufileu 22770 filufint 22771 uffixfr 22774 cfinufil 22779 rnelfmlem 22803 rnelfm 22804 fmfnfmlem1 22805 fmfnfmlem2 22806 fmfnfmlem4 22808 fmfnfm 22809 flfval 22841 fclsfnflim 22878 flimfnfcls 22879 fcfval 22884 alexsublem 22895 metust 23410 cmetss 24167 minveclem4a 24281 filnetlem3 34255 filnetlem4 34256 |
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