3 problems

Characterization conjecture. If $\mathsf D(G)\geq 4$, then $G$ and $G'$ are isomorphic.

Characterization conjecture. If

Let $H$ be a Krull monoid as in Theorem 5.3, with associated set $G_P$, and suppose in addition that … For $k\in\mathbb N$, let $\mathcal U_k(H)$ denote the union of the sets of le…