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Flexible stability and nonsoficity

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arxiv 1906.02172 v3 pith:DRM65YFT submitted 2019-06-05 math.GR

classification math.GR
keywords soficflexiblygroupstableapproximationasymptoticallyconverteddisjoint
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abstract

A sofic group $G$ is said to be flexibly stable if every sofic approximation to $G$ can converted to a sequence of disjoint unions of Schreier graphs by modifying an asymptotically vanishing proportion of edges. We establish that if $\mathrm{PSL}_d(\mathbb{Z})$ is flexibly stable for some $d \geq 5$ then there exists a group which is not sofic.

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Cited by 1 Pith paper

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  1. Stability for product groups and property $(\tau)$

    math.GR 2019-08 accept novelty 8.0 of 10

    Product groups Σ×Λ are not very flexibly P-stable when Σ admits a non-abelian free quotient and Λ lacks property (τ), so P-stability is not closed under direct products.

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