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arXiv · 2607.20135

Polynomial Hilbert-Schmidt stability of the lamplighter group

Alon Dogon·Thomas Vidick
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Abstract

We establish explicit polynomial bounds on the stability rate and radius of the lamplighter group. This provides the first example of an infinitely presented group with an explicit upper bound on the stability radius, answering a question of the first author, Levit and Vigdorovich. Our approach is based on new dynamical notions, including the analysis of approximately invariant measures. We establish an effective continuous tower decomposition procedure for approximately invariant measures with presence of periodic points. To achieve polynomial bounds we appeal to recent techniques from descriptive combinatorics and distributed LOCAL algorithms.

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Alon Dogon, Thomas Vidick. 2026-07-22. Polynomial Hilbert-Schmidt stability of the lamplighter group. https://arxiv.org/abs/2607.20135

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