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arXiv 1906.02422math.AC
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关于具有线性自由分解的理想

On some ideals with linear free resolutions

Stefan O. Tohaneanu

摘要:

给定$Σ\subset\mathbb K[x_1,\ldots,x_k]$,任何有限的线性形式的集合,一些可能的比例,和任何$1\leq a\leq |Σ|$,它已被证明,$I_a(Σ)$,理想产生的所有$a$倍积的$Σ$,有线性分级自由分辨率。本文证明了这一猜想在两种情况下的有效性:第一种情况是当$a=d+1$和$Σ$与最小距离线性码$d$的生成矩阵的列对偶时;第二种情况是当$k=3$和$Σ$定义了$\mathbb P^2$中的行排列(即,不存在比例线性形式)。对于第二种情况,我们研究什么是分次贝蒂数的$I_a(Σ)$。

英文摘要:

Given $Σ\subset\mathbb K[x_1,\ldots,x_k]$, any finite collection of linear forms, some possibly proportional, and any $1\leq a\leq |Σ|$, it has been conjectured that $I_a(Σ)$, the ideal generated by all $a$-fold products of $Σ$, has linear graded free resolution. In this article we show the validity of this conjecture for two cases: the first one is when $a=d+1$ and $Σ$ is dual to the columns of a generating matrix of a linear code of minimum distance $d$; and the second one is when $k=3$ and $Σ$ defines a line arrangement in $\mathbb P^2$ (i.e., there are no proportional linear forms). For the second case we investigate what are the graded betti numbers of $I_a(Σ)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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