Harmonic ultrafilters

Details Harmonic ultrafilters Harmonic ultrafilters

2007-09-08

arxiv.org/abs/0709.1204v1

Mathematics

Combinatorics

Scientific paper

A set of natural numbers will be called \emph{harmonic} if the reciprocals of its elements form a divergent series. An ultrafilter of the natural numbers will he called \emph{harmonic} if all each members are harmonic sets. The harmonic ultrafilters are shown to constitute a compact semigroup under the Glazer addition and its smallest ideal is obtained. This paper is an extension of work begun by Hindman. Alle ingredients are found in the treatise by Hindman and Strauss.

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