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math.GR2022
Coarse fixed point properties
Romain Tessera, Jeroen Winkel
We investigate fixed point properties for isometric actions of topological groups on a wide class of metric spaces, with a particular emphasis on Hilbert spaces. Instead of requiri…
math.FA2022
Cycles in graphs with geometric property (T)
Jeroen Winkel
We show that a sequence of graphs with geometric property (T) has many small cycles. We also show that when a small part of a sequence of graphs with geometric property (T) is chan…