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Applicable Analysis
An International Journal
Volume 94, 2015 - Issue 2
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Articles

On variational problems related to steepest descent curves and self-dual convex sets on the sphere

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Pages 294-307 | Received 13 Sep 2013, Accepted 01 Feb 2014, Published online: 14 Mar 2014
 

Abstract

Let be the family of compact convex subsets of the hemisphere in with the property that contains its dual let , and let The problem to study is considered. It is proved that there exists a minimizing couple such that is self-dual and is on its boundary. More can be said for : the minimum set is a Reuleaux triangle on the sphere. The previous problem is related to the one to find the maximal length of steepest descent curves for quasi-convex functions, satisfying suitable constraints. For , let us refer to [Manselli P, Pucci C. Maximum length of steepest descent curves for quasi-convex functions. Geom. Dedicata. 1991]. Here, quite different results are obtained for .

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