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 (FnR(M))/pnd = 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), and of a bounded free complex whose local Chern character does not vanish on this class.
|Original language||English (US)|
|Number of pages||17|
|State||Published - May 2000|
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