Schauder's fixed point and amenability of a group

Semeon A. Bogatyi, Vitaly V. Fedorchuk

DOI: http://dx.doi.org/10.12775/TMNA.2007.016

Abstract


A criterion for existence of a fixed point for an affine action
of a given group on a compact convex space is presented. From this we derive that
a discrete countable group is amenable if and only if there exists an invariant
probability measure for any action of the group on a Hilbert cube. Amenable properties of the
group of all isometries of the Urysohn universal homogeneous metric space
are also discussed.

Keywords


Amenable groups; fixed points; invariant measures

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