Nonlinear submeans on semigroups
Anthony To‐Ming Lau, Wataru Takahashi · Topological Methods in Nonlinear Analysis · 2003
The purpose of this paper is to study some algebraic structure of submeans on certain spaces $X$ of bounded real valued functions on a semigroup and to find local conditions on $X$ in terms of submean for the existence of a left invariant mean.