Local rings over which all modules have rational Poincaré series

Local rings over which all modules have rational Poincaré series
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所有模都具有有理庞加莱级数的局部环

DOI:
10.1016/0022-4049(94)90134-1
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发表时间:
1994
影响因子:
0.8
通讯作者:
L. Avramov
L. Avramov
中科院分区:
数学2区
文献类型:
--
作者:
L. Avramov

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如果局部环的同伦李代数π * (R)包含一个有限余维的自由李子代数,则对于每一个有限生成的dr -模块M, poincarcarsseriesprm (t) =∑∞n= 0dimkTorRn(M,k)·n表示一个有理函数int,并且所有这些函数存在一个最小公分母。当这个分母是(1 - t)的幂时,环是一个完全交,它最多有一个非二次定义方程。
If the homotopy Lie algebra π∗(R) of a local ringRcontains a free Lie subalgebra of finite codimension, then for each finitely generatedR-moduleMthe Poincaré seriesPRM(t) = ∑∞n= 0dimkTorRn(M,k)·tnrepresents a rational function int, and there is a least common de nominator for all these functions. When this denominator is a power of (1−t), the ringRis a complete intersection, which has at most one non-quadratic defining equation.