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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 23295 | . . 3 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
| 2 | t1t0 23291 | . . 3 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Kol2) |
| 4 | haushmph 23735 | . 2 ⊢ (𝐽 ≃ (KQ‘𝐽) → (𝐽 ∈ Haus → (KQ‘𝐽) ∈ Haus)) | |
| 5 | haushmph 23735 | . 2 ⊢ ((KQ‘𝐽) ≃ 𝐽 → ((KQ‘𝐽) ∈ Haus → 𝐽 ∈ Haus)) | |
| 6 | 3, 4, 5 | ist1-5lem 23763 | 1 ⊢ (𝐽 ∈ Haus ↔ (𝐽 ∈ Kol2 ∧ (KQ‘𝐽) ∈ Haus)) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 ∈ wcel 2114 ‘cfv 6490 Kol2ct0 23249 Frect1 23250 Hauscha 23251 KQckq 23636 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5300 ax-pr 5368 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 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 7361 df-oprab 7362 df-mpo 7363 df-1st 7933 df-2nd 7934 df-1o 8396 df-map 8766 df-topgen 17364 df-qtop 17429 df-top 22837 df-topon 22854 df-cld 22962 df-cn 23170 df-t0 23256 df-t1 23257 df-haus 23258 df-kq 23637 df-hmeo 23698 df-hmph 23699 |
| This theorem is referenced by: reghaus 23768 |
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