Averaged projections, angles between groups and strengthening of Banach property (T)

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Abstract

Recently, Lafforgue introduced a new strengthening of Banach property (T), which he called strong Banach property (T) and showed that this property has implications regarding fixed point properties and Banach expanders. In this paper, we introduce a new strengthening of Banach property (T), called “robust Banach property (T)”, which is weaker than strong Banach property (T), but is still strong enough to ensure similar applications. Using the method of averaged projections in Banach spaces and introducing a new notion of angles between projections, we establish a criterion for robust Banach property (T) and show several examples of groups in which this criterion is fulfilled. We also derive several applications regarding fixed point properties and Banach expanders and give examples of these applications.

Original languageEnglish
Pages (from-to)623-666
Number of pages44
JournalMathematische Annalen
Volume367
Issue number1-2
DOIs
StatePublished - 1 Feb 2017

Keywords

  • 20F99
  • 46B85

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