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机译:On relative injective modules and relative coherent rings
Nanjing Univ, Dept Math, Nanjing 210093, Peoples R China;
Nanjing Inst Technol, Dept Basic Courses, Nanjing, Peoples R China;
cotorsion theory; (m; n)-coherent ring; n)-cotorsion module; n)-flat module; n)-injective module; n)-projective module; preenvelope; FLAT COVERS; ENVELOPES;