描述一般秩半稳层模格式极化变化的Blowing up
Blowing-ups describing the polarization change of moduli schemes of semistable sheaves of general rank
摘要:
设$H$和$H'$是光滑射影曲面$X$上的两个样本线丛,而$M(H)$(分别为。$M(H')$)的粗模方案$H$ -半稳定的(分别为. $H'$ -半稳定)固定类型$(r,c_1,c_2)$的滑轮。我们构造了一个爆破序列,它描述了$M(H)$如何不同于$M(H')$,不仅当$r=2$,而且当$r$是任意的。我们在这里使用的手段是初等变换和带标志层的概念。
英文摘要:
Let $H$ and $H'$ be two ample line bundles over a smooth projective surface $X$, and $M(H)$ (resp. $M(H')$) the coarse moduli scheme of $H$-semistable (resp. $H'$-semistable) sheaves of fixed type $(r,c_1,c_2)$. We construct a sequence of blowing-ups which describes how $M(H)$ differs from $M(H')$ not only when $r=2$ but also when $r$ is arbitrary. Means we here utilize are elementary transforms and the notion of a sheaf with flag.
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