Topological entropy of fuzzified dynamical systems

A discrete dynamical system is given by a compact metric space X and any continuous self-map defined on X. This discrete dynamical system can be naturally extended to the space of fuzzy sets on X. In this paper we study relations between the sizes of the topological entropies cif the original dynamical system and of its fuzzy counterpart. Among other things, we present a constructive proof of the fact that oven very weak assumptions on the crisp discrete dynamical system ensure infinite topological entropy of the fuzzy system. However, we also show that there are subsystems of the fuzzy dynamical system with topological entropy equal to that of the crisp dynamical system. (C) 2010 Elsevier B.V. All rights reserved.