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arXiv 0901.1196math.ACmath.AG
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关于单A-多重分次极小分解

On simple A-multigraded minimal resolutions

Hara Charalambous, Apostolos Thoma

摘要:

设$A$是唯一可逆元为0的半群.对于$A$ -齐次理想我们讨论了$R/I$的单$A$-合合和单极小自由分解的概念.当$I$是格理想时,$R/I$的简单0-合合是$I$中的二项式。我们表明,对于一个适当的选择基地的每一个$A$ -均匀的最小自由决议的$R/I$是简单的。我们引入了gcd复形$D_{gcd}(\bf b)$的度$\mathbf{b}\in \A$。我们证明了$D_{gcd}(\bf b)$的同源性决定了$\bf b$度的$i$ - Betti数.我们讨论了一个必不可少的复杂的$R/I$的概念。证明了当生成$R$ -序列的元素的$A$ -度不可比时,完备交格理想$I$的Koszul复形是$R/I$的必不可少的分解.

英文摘要:

Let $A$ be a semigroup whose only invertible element is 0. For an $A$-homogeneous ideal we discuss the notions of simple $i$-syzygies and simple minimal free resolutions of $R/I$. When $I$ is a lattice ideal, the simple 0-syzygies of $R/I$ are the binomials in $I$. We show that for an appropriate choice of bases every $A$-homogeneous minimal free resolution of $R/I$ is simple. We introduce the gcd-complex $D_{gcd}(\bf b)$ for a degree $\mathbf{b}\in \A$. We show that the homology of $D_{gcd}(\bf b)$ determines the $i$-Betti numbers of degree $\bf b$. We discuss the notion of an indispensable complex of $R/I$. We show that the Koszul complex of a complete intersection lattice ideal $I$ is the indispensable resolution of $R/I$ when the $A$-degrees of the elements of the generating $R$-sequence are incomparable.

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