Truncations of the ring of number-theoretic functions

Details Truncations of the ring of number-theoretic functions Truncations of the ring of number-theoretic functions

1999-04-26

arxiv.org/abs/math/9904143v2

Homology, Homotopy and Applications, volume 2, pp 17-27, 2000

Mathematics

Commutative Algebra

10 pages, no figures, 3 tables

Scientific paper

We study the ring of all functions from the positive integers to some field. This ring, which we call \emph{the ring of number-theoretic functions}, is an inverse limit of the ``truncations'' \Gamma_n consisting of all functions f for which f(m)=0 whenever m > n. Each \Gamma_n is a zero-dimensional, finitely generated (K)-algebra, which may be expressed as the quotient of a finitely generated polynomial ring with a \emph{reversely stable} monomial ideal. Using the description of the free minimal resolution of stable ideals, given by Eliahou-Kervaire, and some additional arguments by Aramova-Herzog and Peeva, we give the Poincar\'e-Betti series for \Gamma_n.

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