Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4623824 | Journal of Mathematical Analysis and Applications | 2006 | 12 Pages |
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*.
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