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Limitations to Frechet's Metric Embedding Method

Yair Batal·Nathan Linial·Manor Mendel·Assaf Naor
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Abstract

Frechet's classical isometric embedding argument has evolved to become a major tool in the study of metric spaces. An important example of a Frechet embedding is Bourgain's embedding. The authors have recently shown that for every e>0 any n-point metric space contains a subset of size at least n^(1-e) which embeds into l_2 with distortion O(\log(2/e) /e). The embedding we used is non-Frechet, and the purpose of this note is to show that this is not coincidental. Specifically, for every e>0, we construct arbitrarily large n-point metric spaces, such that the distortion of any Frechet embedding into l_p on subsets of size at least n^{1/2 + e} is Ω((\log n)^{1/p}).

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Yair Batal, Nathan Linial, Manor Mendel, Assaf Naor. 2004-06-21. Limitations to Frechet's Metric Embedding Method. https://doi.org/10.1007/bf02777357

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