Compactification Alexandroff extension The Alexandroff extension of a topological space (π,T) is a Compact space (πβ,Tβ) with an open embedding π :π βͺπβ such that πβ βππ ={π}, where π is a special point often denoted β. topology πβTββΊ{πβTπβππβπΒ compactπβπ Properties Proper map tidy | en | SemBr