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Holger Kammeyer

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Preprint Oct 2026

Profinite recognition of uniformity

Let $G$ be a semisimple Lie group that is not isogenous to the isometry group of real or complex hyperbolic $n$-space. We show that the rational rank is a profinite invariant for irreducible lattices in $G$, unless $G$ has type $D_{2n}$ which forms a genuine exception. In particular, profinitely isomorphic lattices in...

Holger Kammeyer · 0 citations
Preprint Sep 2026

A counterexample to the determinant approximation conjecture

The determinant approximation conjecture states that for a residually finite group $G$ and a chain $G_i$ of finite index normal subgroups with trivial intersection, the Fuglede-Kadison determinant of every matrix over the group algebra $\mathbb{Q} G$ is the limit of the Fuglede-Kadison determinants of the matrix reduct...

Holger Kammeyer · 1 citation

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