Skip to content
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
11 changes: 11 additions & 0 deletions spaces/S000174/properties/P000023.md
Comment thread
Moniker1998 marked this conversation as resolved.
Original file line number Diff line number Diff line change
@@ -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.
7 changes: 7 additions & 0 deletions spaces/S000174/properties/P000051.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
---
space: S000174
property: P000051
value: false
---

The subspace $2 ^ \omega \setminus \{(0,0,\dots)\} \subseteq X$ is homeomorphic to {S26} without a point, and so has no isolated points.
10 changes: 10 additions & 0 deletions spaces/S000174/properties/P000062.md
Original file line number Diff line number Diff line change
@@ -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.
9 changes: 9 additions & 0 deletions spaces/S000174/properties/P000065.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
---
space: S000174
property: P000065
value: true
---


\[\mathfrak c = |2^\omega| \leq |\omega_1^\omega|
\leq |(2^\omega)^\omega| = \mathfrak c\]
16 changes: 16 additions & 0 deletions spaces/S000174/properties/P000083.md
Original file line number Diff line number Diff line change
@@ -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.
7 changes: 7 additions & 0 deletions spaces/S000174/properties/P000093.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
---
space: S000174
property: P000093
value: false
---

The point $(\omega, \omega,\dots) \in X$ has no countable neighborhood.
7 changes: 7 additions & 0 deletions spaces/S000174/properties/P000139.md
Original file line number Diff line number Diff line change
@@ -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 $1 = \{0\}$.
7 changes: 0 additions & 7 deletions spaces/S000174/properties/P000163.md

This file was deleted.

16 changes: 16 additions & 0 deletions spaces/S000174/properties/P000194.md
Original file line number Diff line number Diff line change
@@ -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.
Loading