Overgroups of the diagonal group in the hyperbolic unitary group over a simple Artin ring. II

Abstract

Overgroups of the diagonal subgroup in the hyperbolic unitary group over a simple Artin ring are considered. It is proved that in most cases, the lattice of the subgroups in question admits the standard description. In particular, this holds for all infinite rings. In our previous papers, a similar result was obtained for fields and skew fields. Bibliography: 19 titles.