Indecomposability of graded modules over a graded ring

Mitsuyasu Hashimoto, Yuntian Yang

Let $R={⨁}_{i\ge 0}{R}_i$ be a Noetherian commutative non-negatively graded ring such that $(R_0,{\mathfrak{m}}_0)$ is a Henselian local ring. Let $\mathfrak{m}$ be its unique g…