Shadow systems and volume of polar convex bodies

Details Shadow systems and volume of polar convex bodies Shadow systems and volume of polar convex bodies

2006-06-13

arxiv.org/abs/math/0606305v2

Mathematics

Metric Geometry

Mathematika 53 (2006), 129-148, here are some corrections of misprints

Scientific paper

We prove that the reciprocal of the volume of the polar bodies, about the Santal\'o point, of a {\em shadow system} of convex bodies $K_t$, is a convex function of $t$. Thus extending to the non-symmetric case a result of Campi and Gronchi. The case that the reciprocal of the volume is an affine function of $t$ is also investigated and is characterized under certain conditions. We apply these results to prove exact reverse Santal\'o inequality for polytopes in $\rd{d}$ that have at most $d+3$ vertices.

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