S. Sprehe

collaborators

2 papers

math.NT2026

On the abundance of rigid meromorphic cocycles for quadratic forms in four variables

Lennart Gehrmann, Sören Sprehe

Let $(V, q)$ be an anisotropic quadratic space of dimension $4$ over the rationals and let $p$ be a prime such that the local quadratic space $V \otimes Q_{p}$ is the orthogon…

math.NT2026

Antisymmetry of real quadratic singular moduli

Sören Sprehe

We confirm a conjecture of Darmon--Vonk on the antisymmetry of real quadratic singular moduli. The proof relies on a careful analysis of rigid meromorphic cocycles à la Darmon--Geh…