Bulletin of the Korean Mathematical Society (대한수학회보)
- Volume 31 Issue 1
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- Pages.35-44
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- 1994
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- 1015-8634(pISSN)
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- 2234-3016(eISSN)
BETTI NUMBERS OVER ARTINIAN LOCAL RINGS
Abstract
In this paper we study exponential growth of Betti numbers over artinian local rings. By the Change of Tor Formula the results in the paper extend to the asymptotic behavior of Betti numbers over Cohen-Macaulay local rings. Using the length function of an artinian ring we calculate an upper bound for the number of generators of modules, this is then used to maximize the number of generators of sygyzy modules. Finally, applying a filtration of an ideal, which we call a Loewy series of an ideal, we derive an invariant B(R) of an artinian local ring R, such that if B(R)>1, then the sequence
Keywords