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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 23583 | . . 3 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
| 2 | t1t0 23579 | . . 3 ⊢ (𝐽 ∈ Fre → 𝐽 ∈ Kol2) | |
| 3 | 1, 2 | syl 18 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Kol2) |
| 4 | haushmph 24024 | . 2 ⊢ (𝐽 ≃ (KQ‘𝐽) → (𝐽 ∈ Haus → (KQ‘𝐽) ∈ Haus)) | |
| 5 | haushmph 24024 | . 2 ⊢ ((KQ‘𝐽) ≃ 𝐽 → ((KQ‘𝐽) ∈ Haus → 𝐽 ∈ Haus)) | |
| 6 | 3, 4, 5 | ist1-5lem 24052 | 1 ⊢ (𝐽 ∈ Haus ↔ (𝐽 ∈ Kol2 ∧ (KQ‘𝐽) ∈ Haus)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 ∈ wcel 2145 ‘cfv 6537 Kol2ct0 23537 Frect1 23538 Hauscha 23539 KQckq 23925 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7420 df-oprab 7421 df-mpo 7422 df-1st 7990 df-2nd 7991 df-1o 8459 df-map 8832 df-topgen 17534 df-qtop 17599 df-top 23125 df-topon 23142 df-cld 23250 df-cn 23458 df-t0 23544 df-t1 23545 df-haus 23546 df-kq 23926 df-hmeo 23987 df-hmph 23988 |
| This theorem is used by: reghaus 24057 |
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