Sigma-compact space
From Topospaces
This article defines a property of topological spaces: a property that can be evaluated to true/false for any topological space|View a complete list of properties of topological spaces
This is a variation of compactness. View other variations of compactness
Contents
Definition
Symbol-free definition
A topological space is said to be sigma-compact or -compact if it has a countable collection of compact subsets such that the union of their interiors is the whole space.