Shadows of convex bodies

Details Shadows of convex bodies Shadows of convex bodies

1989-10-26

arxiv.org/abs/math/9201204v1

Mathematics

Metric Geometry

Scientific paper

It is proved that if $C$ is a convex body in ${\Bbb R}^n$ then $C$ has an affine image $\widetilde C$ (of non-zero volume) so that if $P$ is any 1-codimensional orthogonal projection, $$|P\widetilde C| \ge |\widetilde C|^{n-1\over n}.$$ It is also shown that there is a pathological body, $K$, all of whose orthogonal projections have volume about $\sqrt{n}$ times as large as $|K|^{n-1\over n}$.

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