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| Mirrors > Home > MPE Home > Th. List > ishaus3 | Structured version Visualization version GIF version | ||
| Description: A topological space is Hausdorff iff it is both T0 and R1 (where R1 means that any two topologically distinct points are separated by neighborhoods). (Contributed by Mario Carneiro, 25-Aug-2015.) |
| Ref | Expression |
|---|---|
| ishaus3 | ⊢ (𝐽 ∈ Haus ↔ (𝐽 ∈ Kol2 ∧ (KQ‘𝐽) ∈ Haus)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | haust1 23294 | . . 3 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
| 2 | t1t0 23290 | . . 3 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Kol2) |
| 4 | haushmph 23734 | . 2 ⊢ (𝐽 ≃ (KQ‘𝐽) → (𝐽 ∈ Haus → (KQ‘𝐽) ∈ Haus)) | |
| 5 | haushmph 23734 | . 2 ⊢ ((KQ‘𝐽) ≃ 𝐽 → ((KQ‘𝐽) ∈ Haus → 𝐽 ∈ Haus)) | |
| 6 | 3, 4, 5 | ist1-5lem 23762 | 1 ⊢ (𝐽 ∈ Haus ↔ (𝐽 ∈ Kol2 ∧ (KQ‘𝐽) ∈ Haus)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 ∈ wcel 2113 ‘cfv 6490 Kol2ct0 23248 Frect1 23249 Hauscha 23250 KQckq 23635 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2706 ax-rep 5222 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-nfc 2883 df-ne 2931 df-ral 3050 df-rex 3059 df-reu 3349 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-uni 4862 df-iun 4946 df-br 5097 df-opab 5159 df-mpt 5178 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-suc 6321 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-ov 7359 df-oprab 7360 df-mpo 7361 df-1st 7931 df-2nd 7932 df-1o 8395 df-map 8763 df-topgen 17361 df-qtop 17426 df-top 22836 df-topon 22853 df-cld 22961 df-cn 23169 df-t0 23255 df-t1 23256 df-haus 23257 df-kq 23636 df-hmeo 23697 df-hmph 23698 |
| This theorem is referenced by: reghaus 23767 |
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