A lower bound for the equilateral number of normed spaces

Details A lower bound for the equilateral number of normed spaces A lower bound for the equilateral number of normed spaces

2006-03-27

arxiv.org/abs/math/0603614v1

Proc. Amer. Math. Soc. 136 (2008), 127--131.

Mathematics

Metric Geometry

5 pages

Scientific paper

10.1090/S0002-9939-07-08916-2

We show that if the Banach-Mazur distance between an n-dimensional normed space X and ell infinity is at most 3/2, then there exist n+1 equidistant points in X. By a well-known result of Alon and Milman, this implies that an arbitrary n-dimensional normed space admits at least e^{c sqrt(log n)} equidistant points, where c>0 is an absolute constant. We also show that there exist n equidistant points in spaces sufficiently close to n-dimensional ell p (1 < p < infinity).

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