Intersection Multiplicities over Gorenstein Rings

  title={Intersection Multiplicities over Gorenstein Rings},
  author={Claudia M. Miller and Anurag K. Singh},
Abstract Let R be a complete local ring of dimension d over a perfect field of prime characteristic p, and let M be an R-module of finite length and finite projective dimension. S. Dutta showed that the equality limn→∞ l(F n R (M)) p = l(M) holds when the ring R is a complete intersection or a Gorenstein ring of dimension at most 3. We construct a module over a Gorenstein ring R of dimension five for which this equality fails to hold. This then provides an example of a nonzero Todd class τ3(R… CONTINUE READING

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