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Published online by Cambridge University Press: 20 July 2006
The main goal of this paper is the investigation of a relevantproperty which appears in the various definition of deterministictopological chaos for discrete time dynamical system:transitivity. Starting from the standard Devaney's notion of topological chaosbased on regularity, transitivity, and sensitivity to the initialconditions, the critique formulated by Knudsen is taken intoaccount in order to exclude periodic chaos from this definition.Transitivity (or some stronger versions of it) turns out to be therelevant condition of chaos and its role is discussed by a surveyof some important results about it with the presentation of somenew results. In particular, we study topological mixing, strong transitivity,and full transitivity. Their applications to symbolic dynamics areinvestigated with respect to the relationships with the associatedlanguages.