Includes bibliographical references (pages 363-385) and index.
Basic notions -- Preradicals and torsion theories -- Decompositions of modules -- Supplements in modules -- From lifting to perfect modules -- Hall's marriage theorem -- König's graph theorem.
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"Most of the material in the monograph appears in book form for the first time. The main text is augmented by a plentiful supply of exercises together with comments on further related material and on how the theory has evolved."--Jacket.