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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 23335 | . 2 ⊢ (𝐽 ∈ Haus → 𝐽 ∈ Fre) | |
| 2 | t1sep.1 | . . 3 ⊢ 𝑋 = ∪ 𝐽 | |
| 3 | 2 | t1sncld 23309 | . 2 ⊢ ((𝐽 ∈ Fre ∧ 𝑃 ∈ 𝑋) → {𝑃} ∈ (Clsd‘𝐽)) |
| 4 | 1, 3 | sylan 586 | 1 ⊢ ((𝐽 ∈ Haus ∧ 𝑃 ∈ 𝑋) → {𝑃} ∈ (Clsd‘𝐽)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∈ wcel 2119 {csn 4555 ∪ cuni 4838 ‘cfv 6485 Clsdccld 22999 Frect1 23290 Hauscha 23291 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-iota 6441 df-fun 6487 df-fv 6493 df-topgen 17397 df-top 22877 df-topon 22894 df-cld 23002 df-t1 23297 df-haus 23298 |
| This theorem is referenced by: tgphaus 24100 cnn0opn 24770 csscld 25234 clsocv 25235 abelth 26424 readvrec2 42838 sncldre 45492 dirkercncflem2 46547 |
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