Discrete (P)-closed Groups Acting On Trees

Abstract

Reid-Smith recently parametrised groups acting on trees with Tits' independence property (P) using graph-based combinatorial structures known as local action diagrams. Properties of the acting (topological) group, such as being locally compact, compactly generated or simple, are reflected in its local action diagram. In this article we provide necessary and sufficient conditions on the local action diagram for the associated group to be discrete.