Space-time directional Lyapunov exponents for cellular automata
Maurice Courbage, Brunon Kaminski
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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