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A self-contained treatment of the subject for graduate students, requiring only familiarity with basic notions in module and ring theory. Early chapters give basic tools and notation, deal with torsion free covers over integral domains, and give information on precovers and covers, and preenvelopes and envelopes. Later chapters introduce the notion of cotorsion theory, explain balance of a functor of two variables, and cover applications to ring theory, including Iwanaga-Gorenstein and Cohen-Macaulay rings. Includes chapter exercises. Author credentials are not given. Annotation c. Book News, Inc., Portland, OR (booknews.com)Product Details
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