When spectra of lattices of $z$-ideals are Stone-Čech compactifications

@article{Dube2017,
abstract = {Let $X$ be a completely regular Hausdorff space and, as usual, let $C(X)$ denote the ring of real-valued continuous functions on $X$. The lattice of $z$-ideals of $C(X)$ has been shown by Martínez and Zenk (2005) to be a frame. We show that the spectrum of this lattice is (homeomorphic to) $\beta X$ precisely when $X$ is a $P$-space. This we actually show to be true not only in spaces, but in locales as well. Recall that an ideal of a commutative ring is called a $d$-ideal if whenever two elements have the same annihilator and one of the elements belongs to the ideal, then so does the other. We characterize when the spectrum of the lattice of $d$-ideals of $C(X)$ is the Stone-Čech compactification of the largest dense sublocale of the locale determined by $X$. It is precisely when the closure of every open set of $X$ is the closure of some cozero-set of $X$.},
author = {Dube, Themba},
journal = {Mathematica Bohemica},
keywords = {completely regular frame; coherent frame; $z$-ideal; $d$-ideal; Stone-Čech compactification; booleanization},
language = {eng},
number = {3},
pages = {323-336},
publisher = {Institute of Mathematics, Academy of Sciences of the Czech Republic},
title = {When spectra of lattices of $z$-ideals are Stone-Čech compactifications},
url = {http://eudml.org/doc/294086},
volume = {142},
year = {2017},
}

TY - JOUR
AU - Dube, Themba
TI - When spectra of lattices of $z$-ideals are Stone-Čech compactifications
JO - Mathematica Bohemica
PY - 2017
PB - Institute of Mathematics, Academy of Sciences of the Czech Republic
VL - 142
IS - 3
SP - 323
EP - 336
AB - Let $X$ be a completely regular Hausdorff space and, as usual, let $C(X)$ denote the ring of real-valued continuous functions on $X$. The lattice of $z$-ideals of $C(X)$ has been shown by Martínez and Zenk (2005) to be a frame. We show that the spectrum of this lattice is (homeomorphic to) $\beta X$ precisely when $X$ is a $P$-space. This we actually show to be true not only in spaces, but in locales as well. Recall that an ideal of a commutative ring is called a $d$-ideal if whenever two elements have the same annihilator and one of the elements belongs to the ideal, then so does the other. We characterize when the spectrum of the lattice of $d$-ideals of $C(X)$ is the Stone-Čech compactification of the largest dense sublocale of the locale determined by $X$. It is precisely when the closure of every open set of $X$ is the closure of some cozero-set of $X$.
LA - eng
KW - completely regular frame; coherent frame; $z$-ideal; $d$-ideal; Stone-Čech compactification; booleanization
UR - http://eudml.org/doc/294086
ER -