For a commutative local ring , consider (noncommutative) -algebras of the form where is a reflexive -module with nonzero free direct summand. Such algebras of finite global dimension can be viewed as potential substitutes for, or analogues of, a resolution of singularities of . For example, Van den Bergh has shown that a three-dimensional Gorenstein normal -algebra with isolated terminal singularities has a crepant resolution of singularities if and only if it has such an algebra with finite global dimension and which is maximal Cohen–Macaulay over (a ``noncommutative crepant resolution of singularities’'). We produce algebras having finite global dimension in two contexts: when is a reduced one-dimensional complete local ring, or when is a Cohen–Macaulay local ring of finite Cohen–Macaulay type. If in the latter case is Gorenstein, then the construction gives a noncommutative crepant resolution of singularities in the sense of Van den Bergh.

生成讲解博客的中文版本

生成AI智能校验的中文版本