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Better ref for P168 (cid) #1840

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Merged
prabau merged 2 commits into from
Sep 25, 2026
Merged

Better ref for P168 (cid) #1840

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b9243ba
Better ref for P168 cid
prabau Sep 24, 2026
a761672
remove omegaC alias
prabau Sep 25, 2026
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7 changes: 3 additions & 4 deletions properties/P000168.md
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Expand Up @@ -4,10 +4,9 @@ name: Countable sets are discrete
aliases:
- Countable sets are closed
- Cid
- $\omega$C
refs:
- mathse: 4995501
name: Answer to "Does every door space with an infinite compact set have a single non-isolated point?"
- mathse: 5150079
name: Answer to "Limit points of finite sets"
- zb: "0665.54003"
name: On spaces whose denumerable subspaces are discrete (Ganster, Reilly, Vamanamurthy)
- mathse: 4751818
Expand All @@ -18,7 +17,7 @@ Every {P57} subspace of $X$ is {P52}.

Equivalently, every {P57} subset of $X$ is closed.

(For the equivalence, see comments on {{mathse:4995501}}).
(For the equivalence, see Corollary 2 in {{mathse:5150079}}).

Defined as "cid" in {{zb:0665.54003}} (pg. 283 of
[https://gdz.sub.uni-goettingen.de/id/PPN311571026_0039](https://gdz.sub.uni-goettingen.de/id/PPN311571026_0039?tify=%7B%22pages%22%3A%5B299%5D%2C%22view%22%3A%22%22%7D))
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