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Kazhdan and Haagerup properties from the median viewpoint

Abstract : We prove the existence of a close connection between spaces with measured walls and median metric spaces. We then relate properties (T) and Haagerup (a-T-menability) to actions on median spaces and on spaces with measured walls. This allows us to explore the relationship between the classical properties (T) and Haagerup and their versions using affine isometric actions on $L^p$-spaces. It also allows us to answer an open problem on a dynamical characterization of property (T), generalizing results of Robertson-Steger.
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Contributor : Indira Chatterji <>
Submitted on : Wednesday, April 7, 2010 - 2:15:51 PM
Last modification on : Wednesday, September 16, 2020 - 4:04:52 PM

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  • HAL Id : hal-00471046, version 1
  • ARXIV : 0704.3749



Indira Chatterji, Cornelia Drutu, Frederic Haglund. Kazhdan and Haagerup properties from the median viewpoint. Advances in Mathematics, Elsevier, 2010, pp.Volume 225, Issue 2 (2010), 882 - 921. ⟨hal-00471046⟩



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