2次生成理想的Boij-Soderberg理论
Boij-Soderberg theory for ideals generated by degree 2
摘要:
在Boij-Soderberg理论中,已知对于任何度序列$\mathbf{d}$,存在具有$\mathbf{d}$类型的纯归结的有限生成模。另一方面,在理想的情况下,度序列有两个必要条件,如果存在具有$\mathbf{d}$类型的纯分解的理想,则$\mathbf{d}$满足它们。本文利用一般初始理想理论和Boij-Soderberg分解,构造了满足这些条件但不存在一般初始理想的度序列.
英文摘要:
In Boij-Soderberg theory, it is known that for any degree sequence $\mathbf{d}$, there exists a finitely generated module that has a pure resolution of type $\mathbf{d}$. On the other hand, in the case of ideal, there are two necessary conditions for the degree sequence, which $\mathbf{d}$ satisfies them if there is an ideal that has a pure resolution of type $\mathbf{d}$. In this paper, by theory of generic initial ideals and Boij-Soderberg decompositions, we construct the degree sequence which satisfies these conditions but there is no such an ideal.
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