Regular space
Regular space: A topological space is termed regular if all points are closed sets (the assumption), and, given a point and a closed set not containing it, there are disjoint open sets containing the point and closed set respectively.
In some definitions, the assumption is skipped.
Related terms: regularity (the property of a topological space being regular)
Primary subject wiki entry: Topospaces:Regular space
Also located at: Wikipedia:Regular space, Planetmath:RegularSpace, Mathworld:RegularSpace