Sieve methods in group theory I: Powers in Linear groups

A general sieve method for groups is formulated. It enables one to "measure" subsets of a finitely generated group. As an application we show that if $Γ$ is a finitely generated non virtually-solvable linear group of characteristic zero then the set of proper powers in $Γ$ is exponentially small. This is a far reaching strengthening of the main result of \cite{HKLS}.

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