Covers and envelopes in the category of complexes of modules

the long version

"Covers and Envelopes in the Category of Complexes of Modules collects scattered notes and results into a single, concise volume that provides an account of recent developments in the theory and presents several new and important ideas."--BOOK JACKET. "The author introduces the theory of complexes of modules using only elementary tools, making the field more accessible to non-specialists. He focuses the study on envelopes and covers in this category with respect to some well-established and important classes of complexes. He places particular emphasis on DG-injective and DG-projective complexes and flat and DG-flat covers."--BOOK JACKET. "This work is of particular interest to postgraduate students and research workers in Algebra."--BOOK JACKET.