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Large Equilateral Sets in Subspaces of $$\ell _\infty ^n$$ ℓ ∞ n of Small Codimension
Discrete & Computational Geometry ( IF 0.8 ) Pub Date : 2021-01-22 , DOI: 10.1007/s00454-020-00272-2
Nóra Frankl

For fixed k we prove exponential lower bounds on the equilateral number of subspaces of \(\ell _{\infty }^n\) of codimension k. In particular, we show that subspaces of codimension 2 of \(\ell _{\infty }^{n+2}\) and subspaces of codimension 3 of \(\ell _{\infty }^{n+3}\) have an equilateral set of cardinality \(n+1\) if \(n\ge 7\) and \(n\ge 12\) respectively. Moreover, the same is true for every normed space of dimension n, whose unit ball is a centrally symmetric polytope with at most \({4n}/{3}-o(n)\) pairs of facets.



中文翻译:

小维的$$ \ ell _ \ infty ^ n $$ℓ∞n子空间中的大等边集

对于固定k,我们证明了余维k (\ ell _ {\ infty} ^ n \)的 子空间的等边数个的指数下界。特别地,我们显示 \(\ ell _ {\ infty} ^ {n + 2} \)的第2维子空间和\(\ ell _ {\ infty} ^ {n + 3} \的第3维子空间 具有等边集的基数的\(N + 1 \)如果\(N \ GE 7 \)\(N \ GE 12 \)分别。此外,对于维度为n的每个范数空间,也是如此 ,其单位球是具有最多\({4n} / {3} -o(n)\)个小平面对的中心对称多面体。

更新日期:2021-01-22
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