Abstract

A natural number m is called the homotopy minimal period of a map f : X → X if it is a minimal period for every map g homotopic to f. The set HPer(f) of all minimal homotopy periods is an invariant of the dynamics of f which is the same for a small perturbation of f. In this paper we give a complete description of the sets of homotopy minimal periods of self-maps of nonabelian three dimensional nilmanifold which is a counterpart of the corresponding characterization for three dimensional torus proved by Jiang and Llibre. As a corollary we show that if 2 ∈ HPer(f) then HPer(f) = N for such a map.

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