nLab
irreducible topological space

Contents

Contents

Definition

A topological space XX is called irreducible if it cannot be expressed as union of two proper closed subsets, or equivalently if any two inhabited open subsets have inhabited intersection.

A subset SS of a topological space XX is an irreducible subset if SS is an irreducible topological space with the subspace topology.

An algebraic variety is irreducible if its underlying topological space (in the Zariski topology) is irreducible.

A sober topological space, is one whose only irreducible closed subsets are the closures of single points.

Last revised on April 2, 2020 at 17:20:46. See the history of this page for a list of all contributions to it.