diff --git a/spaces/S000174/properties/P000023.md b/spaces/S000174/properties/P000023.md new file mode 100644 index 0000000000..1154b6372e --- /dev/null +++ b/spaces/S000174/properties/P000023.md @@ -0,0 +1,11 @@ +--- +space: S000174 +property: P000023 +value: false +--- + +At the point $p=(\omega, \omega, \dots)$, the clopen sets +$\{\omega\}^n \times (\omega+1)^\omega$ form a neighborhood base. Each of +these sets has a topology finer than the product topology on +$\{\omega\}^n \times (\omega+1)^\omega$ when $\omega+1$ is discrete. The +latter space is not compact, so none of these neighborhoods is compact. diff --git a/spaces/S000174/properties/P000051.md b/spaces/S000174/properties/P000051.md new file mode 100644 index 0000000000..25f7a2e0c0 --- /dev/null +++ b/spaces/S000174/properties/P000051.md @@ -0,0 +1,7 @@ +--- +space: S000174 +property: P000051 +value: false +--- + +The subspace $2 ^ \omega \setminus \{(0,0,\dots)\} \subseteq X$ is homeomorphic to Cantor set without a point, and so has no isolated points. diff --git a/spaces/S000174/properties/P000062.md b/spaces/S000174/properties/P000062.md new file mode 100644 index 0000000000..672208b51a --- /dev/null +++ b/spaces/S000174/properties/P000062.md @@ -0,0 +1,10 @@ +--- +space: S000174 +property: P000062 +value: false +--- + +The collection $\{\xi^\omega : \xi < \omega_1\}$ is an open cover of $X$. +Every countable subcollection has union contained in $\xi^\omega$ for some +$\xi < \omega_1$, and $\xi^\omega$ is a proper closed subset of $X$. Thus, +no countable subcollection has dense union. diff --git a/spaces/S000174/properties/P000065.md b/spaces/S000174/properties/P000065.md new file mode 100644 index 0000000000..69fecf56c4 --- /dev/null +++ b/spaces/S000174/properties/P000065.md @@ -0,0 +1,9 @@ +--- +space: S000174 +property: P000065 +value: true +--- + + +\[\mathfrak c = |2^\omega| \leq |\omega_1^\omega| +\leq |(2^\omega)^\omega| = \mathfrak c\] diff --git a/spaces/S000174/properties/P000083.md b/spaces/S000174/properties/P000083.md new file mode 100644 index 0000000000..6be284efd6 --- /dev/null +++ b/spaces/S000174/properties/P000083.md @@ -0,0 +1,16 @@ +--- +space: S000174 +property: P000083 +value: false +refs: + - doi: 10.4064/FM-97-2-53-55 + name: "A perfectly normal locally metrizable non-paracompact space" + - zb: "0593.28016" + name: Borel measures (Gardner and Pfeffer) +--- + +Proposition 2 of {{doi:10.4064/FM-97-2-53-55}} constructs a locally countable +subspace of $X$ which is not $\sigma$-discrete. By Theorem 13.3 of +{{zb:0593.28016}}, every locally countable subspace of +a weakly $\delta\theta$-refinable space is $\sigma$-discrete. Hence $X$ is not +weakly $\delta\theta$-refinable and, in particular, is not meta-Lindelöf. diff --git a/spaces/S000174/properties/P000093.md b/spaces/S000174/properties/P000093.md new file mode 100644 index 0000000000..7b68071754 --- /dev/null +++ b/spaces/S000174/properties/P000093.md @@ -0,0 +1,7 @@ +--- +space: S000174 +property: P000093 +value: false +--- + +The point $(\omega, \omega,\dots) \in X$ has no countable neighborhood. diff --git a/spaces/S000174/properties/P000139.md b/spaces/S000174/properties/P000139.md new file mode 100644 index 0000000000..69d03db20e --- /dev/null +++ b/spaces/S000174/properties/P000139.md @@ -0,0 +1,7 @@ +--- +space: S000174 +property: P000139 +value: true +--- + +The point $p := (0, 0, \dots) \in X$ is isolated since $\{p\} = 1^\omega$ where $1 = \{0\}$. diff --git a/spaces/S000174/properties/P000163.md b/spaces/S000174/properties/P000163.md deleted file mode 100644 index 03beb65bf6..0000000000 --- a/spaces/S000174/properties/P000163.md +++ /dev/null @@ -1,7 +0,0 @@ ---- -space: S000174 -property: P000163 -value: true ---- - -$|X| = |\omega_1^\omega| \leq (2^\omega)^\omega = 2^\omega = \mathfrak{c}$. diff --git a/spaces/S000174/properties/P000194.md b/spaces/S000174/properties/P000194.md new file mode 100644 index 0000000000..7a3456cb91 --- /dev/null +++ b/spaces/S000174/properties/P000194.md @@ -0,0 +1,16 @@ +--- +space: S000174 +property: P000194 +value: false +refs: + - doi: 10.4064/FM-97-2-53-55 + name: "A perfectly normal locally metrizable non-paracompact space" + - zb: "0593.28016" + name: Borel measures (Gardner and Pfeffer) +--- + +Proposition 2 of {{doi:10.4064/FM-97-2-53-55}} constructs a locally countable +subspace of $X$ which is not $\sigma$-discrete. By Theorem 13.3 of +{{zb:0593.28016}}, every locally countable subspace of +a weakly $\delta\theta$-refinable space is $\sigma$-discrete. Hence $X$ is not +weakly $\delta\theta$-refinable and, in particular, is not submetacompact.