摘要

A topology on a sernigroup is left invariant if left translations are continuous and open. We show that for every infinite cancellative semigroup S and n is an element of N, there is a zero-dimensional Hausdorff left invariant topology on S with exactly n nonprincipal ultrafilters converging to the same point, all of them being uniform.

  • 出版日期2011-6

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