2020 年 74 巻 2 号 p. 337-352
We prove an identity for multiple zeta star values, which generalizes some identities due to Imatomi, Tanaka, Tasaka and Wakabayashi. This identity gives an analogue of cyclic insertion-type identities, for multiple zeta star values, and connects the block decomposition with Zhao's generalized 2-1 formula.