activity
20062026
most citedExpanders, exact crossed products, and the Baum-Connes conjecture

63 citations · 280 across the 35 of their papers we have counts for

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Showing 2013Show all

3 papers · 1 filter

math.MG2013

Geometric Property (T)

Rufus Willett, Guoliang Yu

This paper discusses `geometric property (T)'. This is a property of metric spaces introduced in earlier work of the authors for its applications to K-theory. Geometric property (T…

math.KT2013★ 63 cited

Expanders, exact crossed products, and the Baum-Connes conjecture

Paul Baum, Erik Guentner, Rufus Willett

We reformulate the Baum-Connes conjecture with coefficients by introducing a new crossed product functor for C*-algebras. All confirming examples for the original Baum-Connes conje…

math.MG2013★ 4 cited

Ghostbusting and property A

John Roe, Rufus Willett

We show that a bounded geometry metric space X has property A if and only if all ghost operators on X are compact.