Abstract
Let d be a square free positive integer and Od the ring of integers in Q(√−d). The main result of this paper is that the groups PSL(2,Od) are subgroup separable on geometrically finite subgroups.
Let d be a square free positive integer and Od the ring of integers in Q(√−d). The main result of this paper is that the groups PSL(2,Od) are subgroup separable on geometrically finite subgroups.