Between quasi-convex and convex set-valu
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J Benoist; N Popovici
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Article
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2004
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Elsevier Science
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English
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The aim of this paper is to give sufficient conditions for a quasi-convex set-valued mapping to be convex. In particular, we recover several known characterizations of convex real-valued functions, given in terms of quasiconvexity and Jensen-type convexity by Nikodem [1], Behringer [2], and Yang, Te