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arXiv · 2611.09181

Hecke Algebras for Minimal Equicontinuous Cantor Actions

Pablo Lummerzheim
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Abstract

In this work we extend the concept of Hecke algebras to a pair of a separable infinite profinite group and a closed core-free subgroup. Motivated by applications to minimal equicontinuous Cantor actions, which are characterized by such pairs, we characterize isometric *-algebra isomorphisms between such Hecke algebras by showing that they always arise as Koopman operators of homeomorphisms between the double coset spaces combined with the multiplication by some character. We then prove that two minimal equicontinuous Cantor actions with isometric isomorphic Hecke algebras have the same Steinitz order. We provide examples including the infinite dihedral group and the Grigorchuk group.

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Pablo Lummerzheim. 2026-11-06. Hecke Algebras for Minimal Equicontinuous Cantor Actions. https://arxiv.org/abs/2611.09181

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