A low-technology estimate in convex geometry

Abstract

Let $K$ be an $n$-dimensional symmetric convex body with $n\ge 4$ and let $K\dual$ be its polar body. We present an elementary proof of the fact that $$(\Vol K)(\Vol K\dual)\ge \frac{b_n^2}{(\log_2 n)^n},$$ where $b_n$ is the volume of the Euclidean ball of radius 1. The inequality is asymptotically weaker than the estimate of Bourgain and Milman, which replaces the ${\log }_{2}n$ by a constant. However, there is no known elementary proof of the Bourgain-Milman theorem.

arXiv commentThe abstract is adapted from the Math Review by Keith Ball, MR 93h:52010