On the Rotation Entropy of Additive Cellular Automata f_∞

In this paper, we first introduce the definition of rotational sets for cellular automata f_∞ using Misiurewicz’s rotational sets. After that, we define rotational entropy functions for cellular automata f_∞ from Bowen’s definiton of rotational entropy. Finally, we compare rotational entropy function with topologic entropy function for cellular automata f_∞.