Representing N-semigroups
John C. Higgins · Bulletin of the Australian Mathematical Society · 1969
AnN-semigroup is a commutative, cancellative, archimedean semigroup with no idempotent element. This paper obtains a representation of finitely generatedN-semigroups as the subdirect product of an abelian group and a subsemigroup of the additive positive integers.