Quasi-basic submodules over valuation domains
The authors define two kinds of new invariants for modules over valuation domains. The first ones form a complete independent set of invariants for direct sums of uniserial modules, including the non-standard ones, and are related to maximal pure direct sums of uniserial submodules isomorphic to a fixed uniserial module. - The second kind of invariants are related to maximal pure direct sums of arbitrary uniserial submodules.
scientific article; zbMATH DE number 510098