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Entropy geometry and disjointness for zero-dimensional algebraic actions

Manfred Einsiedler, Thomas Ward

math.DSarXiv:math/0211447

Abstract

We show that many algebraic actions of higher-rank abelian groups on zero-dimensional groups are mutually disjoint. The proofs exploit differences in the entropy geometry arising from subdynamics and a form of Abramov--Rokhlin formula for half-space entropies.

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