Lennart Gehrmann

activity

20242026

collaborators

3 papers

math.NT2026

On rational quadratic cocycles

Lennart Gehrmann

Let $(V, q)$ be a non-degenerate $n$ -dimensional quadratic space over the rationals of real signature $(r, s)$ . For every integer $1 \leq k \leq min {r, n - 2}$ we construct classes in…

math.NT2025

Evaluation of Bianchi Rigid Meromorphic Cocycles at Big ATR Points

Lennart Gehrmann, Xavier Guitart, Marc Masdeu

We develop the tools required to effectively evaluate the Bianchi rigid meromorphic cocycles introduced by Darmon-Gehrmann-Lipnowski at big ATR points, and use them to obtain the f…

math.NT2024

Iwasawa theory and mock plectic points

Michele Fornea, Lennart Gehrmann

We use Iwasawa theory, at a prime $p$ inert in a quadratic imaginary field $K$ , to study the arithmetic properties of mock plectic invariants for elliptic curves of rank two. More…