Linearly rigid metric spaces and the embedding problem
Linearly rigid metric spaces and the embedding problem
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线性刚性度量空间和嵌入问题
DOI:
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发表时间:
2006
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通讯作者:
Anatoly Vershik
中科院分区:
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作者:
Julien Melleray;Fedor Petrov;Anatoly Vershik
We consider the problem of isometric embedding of metric spaces into Banach spaces, and introduce and study the remarkable class of so-called linearly rigid metric spaces: these are the spaces that admit a unique, up to isometry, linearly dense isometric embedding into a Banach space. The first nontrivial example of such a space was given by R. Holmes; he proved that the universal Urysohn space has this property. We give a criterion of linear rigidity of a metric space, which allows us to give a simple proof of the linear rigidity of the Urysohn space and some other metric spaces. Various properties of linearly rigid spaces and related spaces are considered.