Examples of non-commutative crepant resolutions of Cohen Macaulay normal domains

preprint2014arXivOpen access

Abstract

Let AA be a Cohen-Macaulay normal domain. A non commutative crepant resolution (NCCR) of AA is an AA-algebra ΓΓ of the form Γ=EndA(M)Γ= End_A(M), where MM is a reflexive AA-module, ΓΓ is maximal Cohen-Macaulay as an AA-module and gldim(Γ)P=dim⁡APgldim(Γ)_P = \dim A_P for all primes PP of AA. We give bountiful examples of equi-characteristic Cohen-Macaulay normal local domains and mixed characteristic Cohen-Macaulay normal local domains having NCCR. We also give plentiful examples of affine Cohen-Macaulay normal domains having NCCR.

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