  Since Bandt et al. have shown that the permutation entropy and the
Kolmogorov-Sinai entropy coincide for piecewise monotone interval maps, the
relationship of both entropies for time-discrete dynamical systems is of a
certain interest. The aim of this paper is a discussion of this relationship on
the basis of an ordinal characterization of the Kolmogorov-Sinai entropy
recently given.
