We study almost symmetric numerical semigroups and semigroup rings. We describe a
characteristic property of the minimal free resolution of the semigroup ring of an almost …

The notion of an almost symmetric numerical semigroup was given by V. Barucci and R.
Fröberg in J. Algebra, 188, 418–442 (1997). We characterize almost symmetric numerical …

We study the set of numerical semigroups containing a given numerical semigroup. As an
application we prove characterizations of irreducible numerical semigroups that unify some …

Numerical semigroups that can be expressed as an intersection of symmetric numerical
semigroups Communicated by M.-F. Roy - ScienceDirect Skip to main contentSkip to article …

In this work, we introduce the notion of almost-symmetry for generalized numerical
semigroups. In addition to the main properties occurring in this new class, we present …

One half of a pseudo-symmetric numerical semigroup Page 1 Bull. London Math. Soc. 40 (2008)
347–352 Cо2008 London Mathematical Society doi:10.1112/blms/bdn010 One half of a …

Abstract Let S, TS, T be two numerical semigroups. We study when SS is one half of TT, with
TT almost symmetric. If we assume that the type of TT, t (T) t (T), is odd, then for any SS there …

We study almost symmetric semigroups generated by odd integers. If the embedding
dimension is four, we characterize when a symmetric semigroup that is not complete …

Full article: Every Numerical Semigroup is One Half of Infinitely Many Symmetric Numerical
Semigroups Skip to Main Content Taylor and Francis Online homepage Taylor and Francis …

In this paper we present and study the numerical duplication of a numerical semigroup, a
construction that, starting with a numerical semigroup S and a semigroup ideal E⊆ S …