Perfect irreducible mapping

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A perfect mapping $f$ of a topological space $X$ onto a topological space $Y$ which is irreducible (that is, $Y$ is not the image of any proper closed subset of $X$, cf. also Irreducible mapping).

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