Topological complexity, minimality and systems of order two on torus
Abstract
The dynamical system on T2 which is a group extension over an irrational rotation on T1 is investigated. The criterion when the extension is minimal, a system of order 2 and when the maximal equicontinuous factor is the irrational rotation is given. The topological complexity of the extension is computed, and a negative answer to the latter part of an open question raised by Host-Kra-Maass is obtained.
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