Very good gradings on structural matrix rings

Patrik Lundström, Johan Öinert, Laura Orozco +1

Let $R$ be a nonzero associative unital ring, let $G$ be a group, and let $\rho$ be a preorder on $\{1,\dots ,n\}$. A $G$-grading on $\rho$ induces a very good $G$-grading on the structu…