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Mirrors > Home > MPE Home > Th. List > iskgen3 | Structured version Visualization version GIF version |
Description: Derive the usual definition of "compactly generated". A topology is compactly generated if every subset of 𝑋 that is open in every compact subset is open. (Contributed by Mario Carneiro, 20-Mar-2015.) |
Ref | Expression |
---|---|
iskgen3.1 | ⊢ 𝑋 = ∪ 𝐽 |
Ref | Expression |
---|---|
iskgen3 | ⊢ (𝐽 ∈ ran 𝑘Gen ↔ (𝐽 ∈ Top ∧ ∀𝑥 ∈ 𝒫 𝑋(∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iskgen2 22748 | . 2 ⊢ (𝐽 ∈ ran 𝑘Gen ↔ (𝐽 ∈ Top ∧ (𝑘Gen‘𝐽) ⊆ 𝐽)) | |
2 | iskgen3.1 | . . . . . . . . . 10 ⊢ 𝑋 = ∪ 𝐽 | |
3 | 2 | toptopon 22115 | . . . . . . . . 9 ⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘𝑋)) |
4 | elkgen 22736 | . . . . . . . . 9 ⊢ (𝐽 ∈ (TopOn‘𝑋) → (𝑥 ∈ (𝑘Gen‘𝐽) ↔ (𝑥 ⊆ 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘))))) | |
5 | 3, 4 | sylbi 216 | . . . . . . . 8 ⊢ (𝐽 ∈ Top → (𝑥 ∈ (𝑘Gen‘𝐽) ↔ (𝑥 ⊆ 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘))))) |
6 | vex 3441 | . . . . . . . . . 10 ⊢ 𝑥 ∈ V | |
7 | 6 | elpw 4543 | . . . . . . . . 9 ⊢ (𝑥 ∈ 𝒫 𝑋 ↔ 𝑥 ⊆ 𝑋) |
8 | 7 | anbi1i 625 | . . . . . . . 8 ⊢ ((𝑥 ∈ 𝒫 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘))) ↔ (𝑥 ⊆ 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)))) |
9 | 5, 8 | bitr4di 289 | . . . . . . 7 ⊢ (𝐽 ∈ Top → (𝑥 ∈ (𝑘Gen‘𝐽) ↔ (𝑥 ∈ 𝒫 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘))))) |
10 | 9 | imbi1d 342 | . . . . . 6 ⊢ (𝐽 ∈ Top → ((𝑥 ∈ (𝑘Gen‘𝐽) → 𝑥 ∈ 𝐽) ↔ ((𝑥 ∈ 𝒫 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘))) → 𝑥 ∈ 𝐽))) |
11 | impexp 452 | . . . . . 6 ⊢ (((𝑥 ∈ 𝒫 𝑋 ∧ ∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘))) → 𝑥 ∈ 𝐽) ↔ (𝑥 ∈ 𝒫 𝑋 → (∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽))) | |
12 | 10, 11 | bitrdi 287 | . . . . 5 ⊢ (𝐽 ∈ Top → ((𝑥 ∈ (𝑘Gen‘𝐽) → 𝑥 ∈ 𝐽) ↔ (𝑥 ∈ 𝒫 𝑋 → (∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽)))) |
13 | 12 | albidv 1921 | . . . 4 ⊢ (𝐽 ∈ Top → (∀𝑥(𝑥 ∈ (𝑘Gen‘𝐽) → 𝑥 ∈ 𝐽) ↔ ∀𝑥(𝑥 ∈ 𝒫 𝑋 → (∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽)))) |
14 | dfss2 3912 | . . . 4 ⊢ ((𝑘Gen‘𝐽) ⊆ 𝐽 ↔ ∀𝑥(𝑥 ∈ (𝑘Gen‘𝐽) → 𝑥 ∈ 𝐽)) | |
15 | df-ral 3063 | . . . 4 ⊢ (∀𝑥 ∈ 𝒫 𝑋(∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽) ↔ ∀𝑥(𝑥 ∈ 𝒫 𝑋 → (∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽))) | |
16 | 13, 14, 15 | 3bitr4g 314 | . . 3 ⊢ (𝐽 ∈ Top → ((𝑘Gen‘𝐽) ⊆ 𝐽 ↔ ∀𝑥 ∈ 𝒫 𝑋(∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽))) |
17 | 16 | pm5.32i 576 | . 2 ⊢ ((𝐽 ∈ Top ∧ (𝑘Gen‘𝐽) ⊆ 𝐽) ↔ (𝐽 ∈ Top ∧ ∀𝑥 ∈ 𝒫 𝑋(∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽))) |
18 | 1, 17 | bitri 275 | 1 ⊢ (𝐽 ∈ ran 𝑘Gen ↔ (𝐽 ∈ Top ∧ ∀𝑥 ∈ 𝒫 𝑋(∀𝑘 ∈ 𝒫 𝑋((𝐽 ↾t 𝑘) ∈ Comp → (𝑥 ∩ 𝑘) ∈ (𝐽 ↾t 𝑘)) → 𝑥 ∈ 𝐽))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 ∀wal 1537 = wceq 1539 ∈ wcel 2104 ∀wral 3062 ∩ cin 3891 ⊆ wss 3892 𝒫 cpw 4539 ∪ cuni 4844 ran crn 5601 ‘cfv 6458 (class class class)co 7307 ↾t crest 17180 Topctop 22091 TopOnctopon 22108 Compccmp 22586 𝑘Genckgen 22733 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2707 ax-rep 5218 ax-sep 5232 ax-nul 5239 ax-pow 5297 ax-pr 5361 ax-un 7620 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 846 df-3or 1088 df-3an 1089 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2887 df-ne 2942 df-ral 3063 df-rex 3072 df-reu 3305 df-rab 3306 df-v 3439 df-sbc 3722 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-pss 3911 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4566 df-pr 4568 df-op 4572 df-uni 4845 df-int 4887 df-iun 4933 df-br 5082 df-opab 5144 df-mpt 5165 df-tr 5199 df-id 5500 df-eprel 5506 df-po 5514 df-so 5515 df-fr 5555 df-we 5557 df-xp 5606 df-rel 5607 df-cnv 5608 df-co 5609 df-dm 5610 df-rn 5611 df-res 5612 df-ima 5613 df-ord 6284 df-on 6285 df-lim 6286 df-suc 6287 df-iota 6410 df-fun 6460 df-fn 6461 df-f 6462 df-f1 6463 df-fo 6464 df-f1o 6465 df-fv 6466 df-ov 7310 df-oprab 7311 df-mpo 7312 df-om 7745 df-1st 7863 df-2nd 7864 df-en 8765 df-fin 8768 df-fi 9218 df-rest 17182 df-topgen 17203 df-top 22092 df-topon 22109 df-bases 22145 df-cmp 22587 df-kgen 22734 |
This theorem is referenced by: (None) |
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