Jensen-type geometric shapes

Paweł Pasteczka

Abstract


We present both necessary and sufficient conditions for a convex closed shape such that for every convex function the average integral over the shape does not exceed the average integral over its boundary.

It is proved that this inequality holds for n-dimensional parallelotopes, n-dimensional balls, and convex polytopes having the inscribed sphere (tangent to all its facets) with the centre in the centre of mass of its boundary.


Keywords


Shapes; Platonic shapes; sphere; ball; Jensen's inequality

Mathematics Subject Classification (2010)


39B62; 52B10; 52B11; 52A05

References


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Dragomir, Sever Silvestru and Charles E. M. Pearce. Selected Topics on Hermite-Hadamard Inequalities. Victoria University: RGMIA Monographs, 2000.

Niculescu, Constantin P. "The Hermite-Hadamard inequality for convex functions of a vector variable." Math. Inequal. Appl. 5, no. 4 (2002): 619–623.

Niculescu, Constantin P. and Lars-Erik Persson. Convex Functions and their Applications. A Contemporary Approach, 2nd Ed. Vol. 23 of CMS Books in Mathematics. New York: Springer-Verlag, 2018.


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