Abstract
We show that an assertion made in Gambaudo et al (1999 Nonlinearity 12 443) is not correct and, as a consequence, we confirm and even generalize previous results by those authors (Gambaudo and Rocha 1994 Nonlinearity 7 1251-9). Another main result states that variation of the topological entropy of surface diffeomorphisms is always associated with the unfolding of homoclinic tangencies.
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