
A module \(M\) is called a lifting module if for every submodule \(N\) of \(M\), there exists a direct sum decomposition \(M=M_1\oplus M_2\) with \(M_1\subseteq N\) and \(N\cap M_2\) superfluous in \(M_2\). These modules are dual to the notion of extending (also called, CS) modules. A ring \(R\) is said to be of finite representation type if there exists a finite set of indecomposable right \(R\)-modules such that any other right \(R\)-module is isomorphic to a direct sum of copies of them and \(R\) is said to be of right local type if every indecomposable right \(R\)-module is local. The paper under review shows that the following are equivalent for a ring \(R\): (1) Every right \(R\)-module is a direct sum of lifting modules. (2) Every pure-injective right \(R\)-module is a direct sum of lifting modules. (3) \(R\) is of finite representation type and right local type. As a consequence of the above the authors show that every left and every right pure-injective \(R\)-module is a direct sum of lifting modules if and only if \(R\) is two-sided Artinian serial ring.
pure-injective modules, Artinian rings, Noetherian rings, Injective modules, self-injective associative rings, serial rings, direct sums, Structure and classification for modules, bimodules and ideals (except as in 16Gxx), direct sum decomposition and cancellation in associative algebras), lifting modules, Representation type (finite, tame, wild, etc.) of associative algebras, finite representation type
pure-injective modules, Artinian rings, Noetherian rings, Injective modules, self-injective associative rings, serial rings, direct sums, Structure and classification for modules, bimodules and ideals (except as in 16Gxx), direct sum decomposition and cancellation in associative algebras), lifting modules, Representation type (finite, tame, wild, etc.) of associative algebras, finite representation type
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