Multi-valued function

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A function which assigns to each element $x\in X$ a subset $f(x)$ of a set $Y$: $f(x)\subset Y$, where there is at least one such subset of $Y$ consisting of at least two elements. See also Multi-valued mapping.

How to Cite This Entry:
Multi-valued function. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by L.D. Kudryavtsev (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article