Coherent rings of finite weak global dimension |
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Authors: | Edgar E Enochs Juan Martí nez Herná ndez Alberto del Valle |
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Institution: | Department of Mathematics, University of Kentucky, Lexington, Kentucky 40506-0027 ; Departamento de Matemáticas, Universidad de Murcia, 30001 Murcia, Spain ; Departamento de Matemáticas, Universidad de Murcia, 30001 Murcia, Spain |
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Abstract: | The category of left modules over right coherent rings of finite weak global dimension has several nice features. For example, every left module over such a ring has a flat cover (Belshoff, Enochs, Xu) and, if the weak global dimension is at most two, every left module has a flat envelope (Asensio, Martínez). We will exploit these features of this category to study its objects. In particular, we will consider orthogonal complements (relative to the extension functor) of several classes of modules in this category. In the case of a commutative ring we describe an idempotent radical on its category of modules which, when the weak global dimension does not exceed 2, can be used to analyze the structure of the flat envelopes and of the ring itself. |
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Keywords: | Coherent ring weak global dimension flat envelope |
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