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show long circle is T5 but not perfectly normal (#1104)
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properties/P000015.md

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@@ -20,3 +20,9 @@ in Theorem 1.5.19 of {{zb:0684.54001}} (under the assumption of a {P2} space, bu
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equally valid without this assumption). See also {{mathse:72138}}.
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Defined on page 16 of {{doi:10.1007/978-1-4612-6290-9}} (as perfectly \(T_4\)).
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----
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#### Meta-properties
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- This property is hereditary (see Theorem 2.1.6 in {{zb:0684.54001}}).

properties/P000067.md

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name: Normal space on Wikipedia
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---
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A space that is both {P2} and {P15}. Equivalently, a space that is both {P1} and {P15}.
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A space that is both {P2} and {P15}.
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Equivalently, a space that is both {P1} and {P15}.
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Defined on page 16 of {{doi:10.1007/978-1-4612-6290-9}} as "perfectly normal".
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----
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#### Meta-properties
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- This property is hereditary since {P2} and {P15} are.

properties/P000081.md

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---
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For each $A\subseteq X$ and each $p\in \overline A$ there is a countable subset $D\subseteq A$ such that $p\in \overline D$.
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----
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#### Meta-properties
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- This property is hereditary.

spaces/S000196/properties/P000003.md

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spaces/S000196/properties/P000008.md

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---
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space: S000196
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property: P000008
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value: true
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refs:
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- mathse: 5017774
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name: Why is the "long circle" completely normal ($T_5$)?
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---
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Shown at {{mathse:5017774}}.

spaces/S000196/properties/P000081.md

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---
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space: S000196
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property: P000081
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value: false
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---
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This space contains a copy of {S36}, and
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{S36|P81}.

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