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| Mirrors > Home > MPE Home > Th. List > sncld | Structured version Visualization version GIF version | ||
| Description: A singleton is closed in a Hausdorff space. (Contributed by NM, 5-Mar-2007.) (Revised by Mario Carneiro, 24-Aug-2015.) |
| Ref | Expression |
|---|---|
| t1sep.1 | ⊢ 𝑋 = ∪ 𝐽 |
| Ref | Expression |
|---|---|
| sncld | ⊢ ((𝐽 ∈ Haus ∧ 𝑃 ∈ 𝑋) → {𝑃} ∈ (Clsd‘𝐽)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | haust1 23509 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
| 2 | t1sep.1 | . . 3 ⊢ 𝑋 = ∪ 𝐽 | |
| 3 | 2 | t1sncld 23483 | . 2 ⊢ ((𝐽 ∈ Fre ∧ 𝑃 ∈ 𝑋) → {𝑃} ∈ (Clsd‘𝐽)) |
| 4 | 1, 3 | sylan 591 | 1 ⊢ ((𝐽 ∈ Haus ∧ 𝑃 ∈ 𝑋) → {𝑃} ∈ (Clsd‘𝐽)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1570 ∈ wcel 2143 {csn 4589 ∪ cuni 4872 ‘cfv 6536 Clsdccld 23173 Frect1 23464 Hauscha 23465 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-iota 6492 df-fun 6538 df-fv 6544 df-topgen 17491 df-top 23051 df-topon 23068 df-cld 23176 df-t1 23471 df-haus 23472 |
| This theorem is referenced by: tgphaus 24274 cnn0opn 24944 csscld 25408 clsocv 25409 abelth 26604 readvrec2 43122 sncldre 45764 dirkercncflem2 46818 |
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