Embeddability of locally finite metric spaces into Banach spaces is finitely determined
Embeddability of locally finite metric spaces into Banach spaces is finitely determined
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局部有限度量空间到 Banach 空间的嵌入性是有限确定的
DOI:
10.1090/s0002-9939-2011-11272-3
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
M. Ostrovskii
中科院分区:
文献类型:
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作者:
M. Ostrovskii
The main purpose of the paper is to prove the following results: • Let A be a locally finite metric space whose finite subsets admit uniformly bilipschitz embeddings into a Banach space X. Then A admits a bilipschitz embedding into X. • Let A be a locally finite metric space whose finite subsets admit uniformly coarse embeddings into a Banach space X. Then A admits a coarse embedding into X. These results generalize previously known results of the same type due to Brown–Guentner (2005), Baudier (2007), Baudier–Lancien (2008), and the author (2006, 2009). One of the main steps in the proof is: each locally finite subset of an ultraproduct XU admits a bilipschitz embedding into X. We explain how this result can be used to prove analogues of the main results for other classes of embeddings. 2010 Mathematics Subject Classification: Primary: 46B85; Secondary: 05C12, 46B08, 46B20, 54E35