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A resolvent condition implying power boundedness

Tom 134 / 1999

Béla Nagy, Jaroslav Zemánek Studia Mathematica 134 (1999), 143-151 DOI: 10.4064/sm-134-2-143-151

Streszczenie

The Ritt and Kreiss resolvent conditions are related to the behaviour of the powers and their various means. In particular, it is shown that the Ritt condition implies the power boundedness. This improves the Nevanlinna characterization of the sublinear decay of the differences of the consecutive powers in the Esterle-Katznelson-Tzafriri theorem, and actually characterizes the analytic Ritt condition by two geometric properties of the powers.

Autorzy

  • Béla Nagy
  • Jaroslav Zemánek

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