Submission date: 20 December 2018

Abstract:

We present the basic theory of central subsets of semigroups from the nonstandard perspective. A key feature of this perspective is the replacement of the algebra of ultrafilters with the algebra of elements of iterated hyperextensions, a technique first employed by Mauro Di Nasso.

Mathematics Subject Classification:

Keywords and phrases:

Full text arXiv 1812.08362: pdf, ps.