Mathematics – Dynamical Systems
Scientific paper
2000-05-06
Mathematics
Dynamical Systems
Paper withdrawn; will be replaced by revised version containing application to lattice models
Scientific paper
Paper withdrawn; will be replaced by revised version containing application to lattice models as well. We study hierarchical properties of Sturmian words. These properties are similar to those of substitution dynamical systems. This approach allows one to carry over to Sturmian dynamical systems methods developed in the context of substitutions. For example, it allows for a very simple proof of a uniform ergodic type theorem for additive functions taking values in a Banach space. We then focus on establishing various versions of uniform subadditive ergodic type theorems. The main result states that linear repetitivity of a Sturmian system is equivalent to the validity of a uniform subadditive ergodic theorem which in turn is equivalent to uniform positivity of certain weights. Thus, the results of this paper completely cover the validity of uniform additive and subadditive ergodic theorems on Sturmian systems.
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