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Factorization properties of Krull monoids with infinite class group
{For a non-unit $a$ of an atomic monoid $H$ we call $$L_H(a) = \{k\in {\mathbb N} \mid a = u_1 \ldots u_k \hbox{ with irreducible } u_i\in H\}$$ the set of lengths of $a$. Let $H$ be a Krull monoid with infinite divisor class group such that each divisor