Published online by Cambridge University Press: 20 November 2018
In a recent study of a specific class of quasi-Frobenius rings, Feller has found it useful to introduce the X-rings ([3]). He suggested among others the following topics:
(A) Determine the properties of completely indecomposable rings and matrix rings over completely indecomposable rings.
(B) Determine the properties of modules over quasi-Frobenius X-rings.
We point out that the completely indecomposable rings are the local quasi-Frobenius rings. Problems (A) and (B) then lead naturally to semi-local quasi-Frobenius rings, and to matrix algebra over local quasi-Frobenius rings. These types of rings are discussed in sections 1 and 2.