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arXiv 1407.4085math.ACmath.CO
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关于Betti表和$O$ -序列的分解

On decomposing Betti tables and $O$-sequences

David Cook

摘要:

Boij-Söderberg特征将Betti表分解为纯图的唯一正积分线性组合。给定一个模块的纯决议,我们描述了明确的公式计算分解的贝蒂表的模块给出的分解的截断贝蒂表,反之亦然。Nagel和Sturgeon用$d$ -线性分解描述了理想的贝蒂表的分解;事实上,系数是精确有限的$O$ -序列。利用扩张公式,我们提供了这样一个理想的商环的Betti表分解的系数的一个明确的描述。在此基础上,我们刻画了$O$ -序列的闭凸单纯锥。

英文摘要:

The Boij-Söderberg characterization decomposes a Betti table into a unique positive integral linear combination of pure diagrams. Given a module with a pure resolution, we describe explicit formulae for computing the decomposition of the Betti table of the module given the decomposition of the truncation of the Betti table, and vice versa. Nagel and Sturgeon described the decomposition of Betti tables of ideals with $d$-linear resolutions; indeed, the coefficients are precisely finite $O$-sequences. Using the extension formulae, we provide an explicit description of the coefficients of the decomposition of the Betti table of the quotient ring of such an ideal. Following from this, we describe the closed convex simplicial cone of $O$-sequences.

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