On the necessity of the assumptions used to prove Hardy-Littlewood and Riesz Rearrangement Inequalities 1
arXiv:1003.3166
Abstract
We prove that supermodularity is a necessary condition for the generalized Hardy- Littlewood and Riesz rearrangement inequalities. We also show the necessity of the monotonicity of the kernels involved in the Riesz{type integral.
8 pages