Points on Hemispheres

Details Points on Hemispheres Points on Hemispheres

2006-10-04

arxiv.org/abs/math/0610140v2

Mathematics

Metric Geometry

Scientific paper

We will show that for any $n\ge N$ points on the $N$-dimensional sphere $S^N$ there is a closed hemisphere which contains at least $\lfloor\frac{n+N+1}{2}\rfloor$ of these points. This bound is sharp and we will calculate the amount of sets which realize this value. If we change to open hemispheres things will be easier. For any $n$ points on the sphere there is an open hemisphere which contains at least $\lfloor\frac{n+1}{2}\rfloor$ of these points, independent of the dimension. This bound is sharp.

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