24 citations · 29 across the 6 of their papers we have counts for
6 papers
Abstract involutions of algebraic groups and of Kac-Moody groups
Ralf Köhl, Max Horn, Bernhard Muhlherr
Based on the second author's thesis in this article we provide a uniform treatment of abstract involutions of algebraic groups and of Kac-Moody groups using twin buildings, RGD sys…
The local recognition of reflection graphs of spherical Coxeter groups
Ralf Köhl, Jonathan I. Hall, Armin Straub
Based on the third author's thesis in this article we complete the local recognition of commuting reflection graphs of spherical Coxeter groups arising from irreducible crystallogr…
Isomorphisms of unitary forms of Kac-Moody groups over finite fields
Ralf Köhl, Andreas Mars
We use methods developed by Caprace and Mühlherr to solve the isomorphism problem of unitary forms of infinite split Kac-Moody groups over finite fields of square order.
The sphericity of the complex of non-degenerate subspaces
Alice Devillers, Ralf Köhl, Bernhard Muhlherr
We prove that the complex of proper non-trivial non-degenerate subspaces of a finite-dimensional vector space endowed with a non-degenerate sesquilinear form is homotopy equivalent…
Intransitive geometries and fused amalgams
Ralf Köhl, Max Horn, Antonio Pasini +1
We study geometries that arise from the natural action on the geometry of one-dimensional subspaces, of nonsingular two-dimensional subspaces, and of nonsingular three-dim…
Final group topologies, Kac-Moody groups and Pontryagin duality
Helge Glockner, Ralf Köhl, Tobias Hartnick
We study final group topologies and their relations to compactness properties. In particular, we are interested in situations where a colimit or direct limit is locally compact, a…