Some Discrete Propositions in IVSs Year: 2009 Volume: 3 Issue: 1 46 - 48 Pages Authors: A. Pouhassani Abstract: The aim of this paper is to exhibit some properties of local topologies of an IVS. Also, we Introduce ISG structure as an interesting structure of semigroups in IVSs. Keywords: IVS ISG Local topology Lebesgue number Lindelof theorem