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Enveloping semigroups of systems of order d

In this paper we study the Ellis semigroup of a d-step nilsystem and the inverse limit of such systems. By using the machinery of cubes developed by Host, Kra and Maass, we prove that such a system has a d-step topologically nilpotent enveloping semigroup. In the case d=2, we prove that these notions are equivalent, extending a previous result by Glasner.

preprint2013arXivOpen access
Sebastián Donoso
math.DS
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Sebastián Donoso

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