Combinatorial characterization of Schur ultrafilters on countable commutative groups, plus construction of a free non-infinitary Schur ultrafilter on Z and existence of a free Schur P-point on Z under CH.
Zlatoˇ s,The Bohr compactification of an abelian group as a quotient of its Stone- ˇCech compactifi- cation, Semigroup Forum,101(2020), 497–506
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Combinatorics of Schur ultrafilters
Combinatorial characterization of Schur ultrafilters on countable commutative groups, plus construction of a free non-infinitary Schur ultrafilter on Z and existence of a free Schur P-point on Z under CH.