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math.FA2019
Amenable semigroups and nonexpansive dynamical systems
Andrzej Wiśnicki
We characterize amenability of subspaces of , where is a semitopological semigroup, in terms of fixed point properties of nonexpansive actions. In particular, we give a c…
math.DS2019
Around the nonlinear Ryll-Nardzewski theorem
Andrzej Wiśnicki
Suppose that is a weak compact convex subset of a dual Banach space with the Radon-Nikodým property. We show that if is a nonexpansive and norm-distal dynamic…