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A [[Continuous mapping|continuous mapping]] $f$ of a [[Topological space|topological space]] $X$ into a subspace $A$ which is the identity on $A$, i.e. is such that $f(x)=x$ for all $x\in A$.



====Comments====
Cf. [[Retract of a topological space|Retract of a topological space]] for more information and references.

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How to Cite This Entry:
Retraction. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Retraction&oldid=32408

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

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