From 46373a33ddaf1e5d1dcc167ecee9a716bb8af4fa Mon Sep 17 00:00:00 2001 From: Batixx Date: Thu, 1 Jan 2026 19:30:10 +0100 Subject: [PATCH 1/4] Improve definition of S108 --- spaces/S000108/README.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/spaces/S000108/README.md b/spaces/S000108/README.md index 1df5c7a51..c604611ae 100644 --- a/spaces/S000108/README.md +++ b/spaces/S000108/README.md @@ -1,12 +1,12 @@ --- uid: S000108 -name: Stone-Cech compactification of the integers +name: Stone-Čech compactification of the integers aliases: - Beta N - βN - Beta Z - Beta omega - - Stone-Cech compactification of the natural numbers + - Stone-Čech compactification of the natural numbers counterexamples_id: 111 refs: - zb: "0386.54001" @@ -15,9 +15,9 @@ refs: name: Stone–Čech compactification on Wikipedia --- -$\beta \omega$ is the set of all ultrafilters on $\omega=\{0,1,2\dots\}$, -where we identify $n$ with the principal ultrafilter containing $n$. -The topology on $\beta\omega$ is generated by all sets of the form +The Stone-Čech compactification of {S2}. Explicitly, $X=\beta \omega$ is the set of all ultrafilters on $\omega=\{0,1,2\dots\}$, +where we identify $n \in \omega$ with the principal ultrafilter containing $n$. +The topology on $X$ is generated by all sets of the form $\overline U = \{F \in \beta\omega : U \in F\}$ for $U \subset \omega$. Defined as counterexample #111 ("Stone-Cech Compactification of the Integers") From 4b86110015ed6e9cb1684356e60705b2faa67e4f Mon Sep 17 00:00:00 2001 From: Batixx Date: Fri, 9 Jan 2026 23:15:52 +0100 Subject: [PATCH 2/4] apply prabau suggestions --- spaces/S000108/README.md | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/spaces/S000108/README.md b/spaces/S000108/README.md index c604611ae..f3088d9a7 100644 --- a/spaces/S000108/README.md +++ b/spaces/S000108/README.md @@ -1,12 +1,8 @@ --- uid: S000108 -name: Stone-Čech compactification of the integers +name: Stone-Čech compactification $\beta\omega$ of the integers aliases: - - Beta N - - βN - - Beta Z - - Beta omega - - Stone-Čech compactification of the natural numbers + - \beta\mathbb{N} counterexamples_id: 111 refs: - zb: "0386.54001" From c6a81fe35cb5a04916231a4d257f4ed422418b59 Mon Sep 17 00:00:00 2001 From: Batixx Date: Fri, 9 Jan 2026 23:18:07 +0100 Subject: [PATCH 3/4] typo? --- spaces/S000108/README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/spaces/S000108/README.md b/spaces/S000108/README.md index f3088d9a7..40b8b68dd 100644 --- a/spaces/S000108/README.md +++ b/spaces/S000108/README.md @@ -2,7 +2,7 @@ uid: S000108 name: Stone-Čech compactification $\beta\omega$ of the integers aliases: - - \beta\mathbb{N} + - $\beta\mathbb{N}$ counterexamples_id: 111 refs: - zb: "0386.54001" From 951586c001fb60f1245252dc293309105b63c3f2 Mon Sep 17 00:00:00 2001 From: Patrick Rabau <70125716+prabau@users.noreply.github.com> Date: Sat, 10 Jan 2026 00:19:31 -0500 Subject: [PATCH 4/4] minor adjustments --- spaces/S000108/README.md | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/spaces/S000108/README.md b/spaces/S000108/README.md index 40b8b68dd..6da25602e 100644 --- a/spaces/S000108/README.md +++ b/spaces/S000108/README.md @@ -11,10 +11,11 @@ refs: name: Stone–Čech compactification on Wikipedia --- -The Stone-Čech compactification of {S2}. Explicitly, $X=\beta \omega$ is the set of all ultrafilters on $\omega=\{0,1,2\dots\}$, +The Stone-Čech compactification of {S2}. +One way to describe $X=\beta \omega$ is as the set of all ultrafilters on $\omega=\{0,1,2\dots\}$, where we identify $n \in \omega$ with the principal ultrafilter containing $n$. The topology on $X$ is generated by all sets of the form -$\overline U = \{F \in \beta\omega : U \in F\}$ for $U \subset \omega$. +$\overline U = \{F \in \beta\omega : U \in F\}$ for $U \subseteq \omega$. -Defined as counterexample #111 ("Stone-Cech Compactification of the Integers") +Defined as counterexample #111 ("Stone-Čech Compactification of the Integers") in {{zb:0386.54001}}.