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arXiv 0811.1865math.ACmath.CO
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图的理想的第一非线性合线

First Nonlinear Syzygies of Ideals Associated to Graphs

Oscar Fernandez-Ramos, Philippe Gimenez

摘要:

考虑一个理想的$I\subset K[x_1,..., x_n]$,其中$K$是一个任意的场,由二次单项式生成。假设$I$不具有线性分解,确定了$I$的最小分次自由分解的步$s$,并证明了在这步分解中非线性合集中在度$s+3$中,计算了相应的分次贝蒂数$β_{s,s+3}$ .确定了这些非线性合的多重度,并证明了相应的多重分次贝蒂数都等于1.

英文摘要:

Consider an ideal $I\subset K[x_1,..., x_n]$, with $K$ an arbitrary field, generated by monomials of degree two. Assuming that $I$ does not have a linear resolution, we determine the step $s$ of the minimal graded free resolution of $I$ where nonlinear syzygies first appear, we show that at this step of the resolution nonlinear syzygies are concentrated in degree $s+3$, and we compute the corresponding graded Betti number $β_{s,s+3}$. The multidegrees of these nonlinear syzygies are also determined and the corresponding multigraded Betti numbers are shown to be all equal to 1.

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