Uniform points in semitopological semigroups

Let S be a Hausdorff non-compact semitopological semigroup. Since Lmc-compactification has been described by e– ultrafilters, the norm of e– ultrafilters can be defined. In a discrete case, every e– ultrafilter is an ultrafilter and so this two definition in discrete case are equivalent. In this paper, uniform e– ultrafilter points are defined and it is shown that if S is left cancellative, then the collection of all uniform e– ultrafilters is a left ideal of SLmc. Also if S is cancellative, then the collection of all uniform e– ultrafilters is an ideal of SLmc.