Charles University in Prague, Faculty of Mathematics and Physics
Abstract
summary:Let X be a hypergroup. In this paper, we define a locally convex topology β on L(X) such that (L(X),β)∗ with the strong topology can be identified with a Banach subspace of L(X)∗. We prove that if X has a Haar measure, then the dual to this subspace is LC(X)∗∗=cl{F∈L(X)∗∗;F has compact carrier\}. Moreover, we study the operators on L(X)∗ and L0∞(X) which commute with translations and convolutions. We prove, among other things, that if wap(L(X)) is left stationary, then there is a weakly compact operator T on L(X)∗ which commutes with convolutions if and only if L(X)∗∗ has a topologically left invariant functional. For the most part, X is a hypergroup not necessarily with an involution and Haar measure except when explicitly stated