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Fixed point property and the Fourier algebra of a locally compact group
Authors:Anthony To-Ming Lau  Michael Leinert
Institution:Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2G1 ; Institut für Angewandte Mathematik, Universität Heidelberg, Im Neuenheimer Feld, Gebäude 294, 69120 Heidelberg, Germany
Abstract:We establish some characterizations of the weak fixed point property (weak fpp) for noncommutative (and commutative) $ \mathcal{L}^1$ spaces and use this for the Fourier algebra $ A(G)$ of a locally compact group $ G.$ In particular we show that if $ G$ is an IN-group, then $ A(G)$ has the weak fpp if and only if $ G$ is compact. We also show that if $ G$ is any locally compact group, then $ A(G)$ has the fixed point property (fpp) if and only if $ G$ is finite. Furthermore if a nonzero closed ideal of $ A(G)$ has the fpp, then $ G$ must be discrete.

Keywords:Weak fixed point property  nonexpansive mapping  Fourier algebra  noncommutative $\mathcal {L}^1$ space  semifinite von~Neumann algebra
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