# Retraction

From Encyclopedia of Mathematics

A continuous mapping of a topological space into a subspace which is the identity on , i.e. is such that for all .

#### Comments

Cf. Retract of a topological space for more information and references.

**How to Cite This Entry:**

Retraction.

*Encyclopedia of Mathematics.*URL: http://encyclopediaofmath.org/index.php?title=Retraction&oldid=11680

This article was adapted from an original article by M.I. Voitsekhovskii (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article