Algebraic properties of some compact spaces. (English) Zbl 1015.54008

Summary: Almost discrete spaces and in particular, the one-point compactifications of discrete spaces are algebraically characterized. This algebraic characterization is then used to show that whenever \(C(X)\approx C(Y)\) and \(X\) is the one-point compactification of a discrete space, then \(Y\) is too. Some equivalent algebraic properties of almost locally compact spaces and nowhere compact spaces are studied. Using these properties we show that every completely regular space can be decomposed into two disjoint subspaces, where one is an open almost locally compact space and the other is a nowhere compact space. Finally, we show that \(X\) is Lindelöf if and only if every strongly divisible ideal in \(C(X)\) is fixed.


54C40 Algebraic properties of function spaces in general topology