3 papers
math.RT2021
Representations of Quantum Minimal Surface Algebrasvia Kac-Moody-theory
Jens Hoppe, Ralf Köhl, Robin Lautenbacher
We consider epimorphisms from quantum minimal surface algebras onto involutroy subalgebras of split real simply-laced Kac-Moody algebras and provide examples of affine and finite t…
math.GR2020
On Rigidity of -Arithmetic Kac-Moody Groups
Amir Farahmand Parsa, Ralf Köhl
In this article we investigate rigidity properties of -arithmetic Kac-Moody groups in characteristic .
math.GR2018
An extension theorem for embedded Riemannian symmetric spaces of non-compact type and an application to their universal property
Julius Grüning, Ralf Köhl
It is known that a geodesic Y in an abstract reflection space X in the sense of Loos, without any assumption of differential structure, canonically admits an action of a 1-paramete…