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A Katznelson-Tzafriri type theorem for Cesàro bounded operators (1506.06609v3)

Published 22 Jun 2015 in math.FA

Abstract: We extend the well-known Katznelson-Tzafriri theorem, originally posed for power-bounded operators, to the case of Ces`aro bounded operators of any order $\alpha>0.$ For this purpose, we use a functional calculus between a new class of fractional Wiener algebras and the algebra of bounded linear operators, whose existence is characterized by the Ces`aro boundedness. Finally, we apply the main theorem to get ergodicity results for the Ces`aro means of bounded operators.

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