Article ID Journal Published Year Pages File Type
4623824 Journal of Mathematical Analysis and Applications 2006 12 Pages PDF
Abstract

We prove that the integral of n functions over a symmetric set L in Rn, with additional properties, increases when the functions are replaced by their symmetric decreasing rearrangements. The result is known when L is a centrally symmetric convex set, and our result extends it to nonconvex sets. We deduce as consequences, inequalities for the average of a function whose level sets are of the same type as L, over measurable sets in Rn. The average of such a function on E is maximized by the average over the symmetric set E*.

Related Topics
Physical Sciences and Engineering Mathematics Analysis