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- W2964334405 abstract "In this paper we study endomorphism rings of finite global dimension over not necessarily normal commutative rings. These objects have recently attracted attention as noncommutative (crepant) resolutions, or NC(C)Rs, of singularities. We propose a notion of a NCCR over any commutative ring that appears weaker but generalizes all previous notions. Our results yield strong necessary and sufficient conditions for the existence of such objects in many cases of interest. We also give new examples of NCRs of curve singularities, regular local rings and normal crossing singularities. Moreover, we introduce and study the global spectrum of a ring R, that is, the set of all possible finite global dimensions of endomorphism rings of MCM R-modules. Finally, we use a variety of methods to compute global dimension for many endomorphism rings." @default.
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- W2964334405 date "2014-11-22" @default.
- W2964334405 modified "2023-10-03" @default.
- W2964334405 title "Noncommutative (Crepant) Desingularizations and the Global Spectrum of Commutative Rings" @default.
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- W2964334405 doi "https://doi.org/10.1007/s10468-014-9510-y" @default.
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