On critical exponents in fixed points of binary k-uniform morphisms

  • Authors:
  • Dalia Krieger

  • Affiliations:
  • School of Computer Science, University of Waterloo, Waterloo, ON, Canada

  • Venue:
  • STACS'06 Proceedings of the 23rd Annual conference on Theoretical Aspects of Computer Science
  • Year:
  • 2006

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Abstract

Let w be an infinite fixed point of a binary k-uniform morphism f, and let E(w) be the critical exponent of w. We give necessary and sufficient conditions for E(w) to be bounded, and an explicit formula to compute it when it is. In particular, we show that E(w) is always rational. We also sketch an extension of our method to non-uniform morphisms over general alphabets. MSC: 68R15.