Isomorphism rigidity in entropy rank two
Abstract
We study the rigidity properties of a class of algebraic Z3-actions with entropy rank two. For this class, conditions are found which force an invariant measure to be the Haar measure on an affine subset. This is applied to show isomorphism rigidity for such actions, and to provide examples of non-isomorphic Z3-actions with all their Z2-sub-actions isomorphic. The proofs use lexicographic half-space entropies and total ergodicity along critical directions.
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