The system of sets of lengths in Krull monoids under set addition

Alfred Geroldinger (1) , Wolfgang Schmid (2)

1 IM - Institut für Mathematik [Graz]
2 LAGA - Laboratoire Analyse, Géométrie et Applications

Let $H$ be a Krull monoid with class group $G$ and suppose that each class contains a prime divisor. Then every element $a \in H$ has a factorization into irreducible elements, and the set $\mathsf L (a)$ of all possible factorization lengths is the set of lengths of $a$. We consider the system $\mathcal L (H) = \{ \mathsf L (a) \mid a \in H \}$ of all sets of lengths, and we characterize (in terms of the class group $G$) when $\mathcal L (H)$ is additively closed under set addition.

Mots clés: Krull monoids; sets of lengths; zero-sum sequences; minimal sets of distances; maximal orders

Domaines: Algèbre commutative [math.AC]; Combinatoire [math.CO]

Alfred Geroldinger, Wolfgang Schmid. The system of sets of lengths in Krull monoids under set addition. 2014. ⟨hal-01020157v2⟩