Coverings by convex bodies and inscribed balls

Details Coverings by convex bodies and inscribed balls Coverings by convex bodies and inscribed balls

2003-12-05

arxiv.org/abs/math/0312133v1

Mathematics

Functional Analysis

6 pages

Scientific paper

Let $H$ be a Hilbert space. For a closed convex body $A$ denote by $r(A)$ the
supremum of radiuses of balls, contained in $A$. We prove, that
$\sum_{n=1}^\infty r(A_n) \ge r(A)$ for every covering of a convex closed body
$A \subset H$ by a sequence of convex closed bodies $A_n$, $n \in \N$. It looks
like this fact is new even for triangles in a 2-dimensional space.

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