Ifis a unimodal map, then its topological entropy is related to the smallest positive zero s of a certain power series (the kneading invariant of f) by. Moreover, it is implicit in the results of Jonker and Rand that for each positive entropy basic setin the renormalization decomposition of the non-wandering set of f, there is a real zeroof the kneading invariant such that. Here we prove a similar result for Lorenz maps. In contrast to the unimodal case, it is possible for two basic sets in the renormalization decomposition of the non-wandering set of a Lorenz map to have the same entropy, and we show that in this case there is a corresponding double zero of the kneading invariant.
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