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Space-time directional Lyapunov exponents for cellular automata

Maurice Courbage, Brunon Kaminski

nlin.CGarXiv:nlin/0603058

Abstract

Space-time directional Lyapunov exponents are introduced. They describe the maximal velocity of propagation to the right or to the left of fronts of perturbations in a frame moving with a given velocity. The continuity of these exponents as function of the velocity and an inequality relating them to the directional entropy is proved.

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