On the Rankin–Selberg L-function related to the Godement–Jacquet L-function.

We consider the k-th Riesz mean for the coefficients of the Rankin–Selberg L-function related to the Godement–Jacquet L-function with respect to S L (n , Z) and establish an asymptotic formula with a good error term for k ≥ k 0 (n) where k 0 (n) is a positive integer depending only on n. [ABSTRACT FROM AUTHOR]