Iterated function systems and control languages

  • Authors:
  • Henning Fernau;Ludwig Staiger

  • Affiliations:
  • Univ. Tübingen, Tübingen, Germany;Martin-Luther-Univ., Halle, Germany

  • Venue:
  • Information and Computation
  • Year:
  • 2001

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Abstract

Valuations---morphisms from (∑*, ·, e) to ((0,∞ ), ·, 1)---are a generalization of Bernoulli morphisms introduced by Eilenberg ["Automata, languages, and machines," Academic Press, New York, 1974]. Here, we show how to generalize the notion of entropy (of a language) in order to obtain new formulas to determine the Hausdorff dimension of fractal sets (also in Euclidean spaces), especially defined via regular (ω-) languages. By doing this, we can sharpen and generalize earlier results in two ways: first, we treat the case where the underlying basic iterated function system contains noncontractive mappings and, second, we obtain results valid for nonregular languages as well. Copyright 2001 Academic Press.