5 papers
Nilpotency of locally isotropic -functor
Egor Voronetsky
We show that the -functor modeled on locally isotropic reductive groups is hypoabelian if the base ring has finite Bass--Serre dimension and, for the Tits index $ \…
Weyl elements in isotropic reductive groups
Egor Voronetsky
We study Weyl elements in isotropic reductive groups over commutative rings. Our main result in an explicit formula for squares of such elements. We also classify these elements in…
The Diophantine problem in isotropic reductive groups
Egor Voronetsky
We begin to study model-theoretic properties of non-split isotropic reductive group schemes. In this paper we show that the base ring is e-interpretable in the point group $G(K…
Locally isotropic Steinberg groups II. Schur multipliers
Egor Voronetsky
We compute Schur multipliers of locally isotropic Steinberg groups and of all root graded Steinberg groups with root systems of rank at least (excluding the types $ \mathsf H…
Locally isotropic Steinberg groups I. Centrality of the -functor
Egor Voronetsky
We begin to study Steinberg groups associated with a locally isotropic reductive group over a arbitrary ring. We propose a construction of such a Steinberg group functor as a g…