\(S\)-arithmetic spinor groups with the same finite quotients and distinct \(\ell^2\)-cohomology
Summary: In this note we refine examples by Aka from arithmetic to \(S\)-arithmetic groups to show that the vanishing of the \(i\)-th \(\ell^2\)-Betti number is not a profinite invariant for all \(i\geq 2\).
scientific article; zbMATH DE number 7357936
scientific article