On the Constant of Homothety for Covering a Convex Set with Its Smaller Copies

Details On the Constant of Homothety for Covering a Convex Set with Its Smaller Copies On the Constant of Homothety for Covering a Convex Set with Its Smaller Copies

2009-01-17

arxiv.org/abs/0901.2652v1

Mathematics

Metric Geometry

4 pages, no figures

Scientific paper

Let $H_d$ denote the smallest integer $n$ such that for every convex body $K$ in $\Re^d$ there is a $0<\lambda < 1$ such that $K$ is covered by $n$ translates of $\lambda K$. In the book \emph{Research problems in discrete geometry.} by Brass, Moser and Pach, the following problem was posed: Is there a $0<\lambda_d<1$ depending on $d$ only with the property that every convex body $K$ in $\Re^d$ is covered by $H_d$ translates of $\lambda_d K$? We prove the affirmative answer to the question and hence show that the Gohberg--Markus--Boltyanski--Hadwiger Conjecture (according to which $H_d\leq 2^d$) holds if, and only if, a formally stronger version of it holds.

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