Lecture Notes on Bayesian Estimation and Classification
《Lecture Notes on Bayesian Estimation and Classification》 · 第 81 页 · Section 3.3「Direct Decompositions」，小节「Remak Decompositions」
The significance of the equivalent conditions of 3.3.1 is that they guarantee that an $\Omega$-group may be expressed as a direct product of finitely many nontrivial $\Omega$-indecomposable subgroups: such a direct decomposition is called a Remak decomposition.