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A '''set-valued function''', also called a '''correspondence''' or '''set-valued [[Relation (mathematics)|relation]]''', is a mathematical [[Function (mathematics)|function]] that maps elements from one set, the [[___domain of a function|___domain of the function]], to subsets of another set.<ref name=":02">{{Cite book |last1=Aliprantis |first1=Charalambos D. |url=https://books.google.com/books?id=Ma31CAAAQBAJ |title=Infinite Dimensional Analysis: A Hitchhiker's Guide |last2=Border |first2=Kim C. |date=2013-03-14 |publisher=Springer Science & Business Media |isbn=978-3-662-03961-8 |pages=523 |language=en}}</ref><ref name=":0">{{Cite book |last1=Wriggers |first1=Peter |url=https://books.google.com/books?id=R4lqCQAAQBAJ |title=New Developments in Contact Problems |last2=Panatiotopoulos |first2=Panagiotis |date=2014-05-04 |publisher=Springer |isbn=978-3-7091-2496-3 |pages=29 |language=en}}</ref> Set-valued functions are used in a variety of mathematical fields, including [[Mathematical optimization|optimization]], [[control theory]] and [[game theory]].
Set-valued functions are also known as [[multivalued function]]s in some references,<ref>{{Cite book |last=Repovš |first=Dušan
== Distinction from multivalued functions ==
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