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arXiv 1104.4297math.AG
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复曲面的喷流格式

Jet schemes of toric surfaces

Hussein Mourtada

摘要:

对于$m\in \mathbb{N}, m\geq 1,$,我们确定了法向复曲面$S.$的$m-th$喷流格式的不可约分量,并给出了这些分量的个数及其维数的公式。当$m$变化时,这些分量产生投射系统,我们将其与加权图相关联。证明了该图的数据等价于$S.$的解析型数据,并利用一个称为特殊性指数的整数不变量对这些不可约分量进行了分类.证明了当$m$足够大时,具有特殊性指标$1,$的分支集与出现在$S.$的最小分解上的例外因子集1-1对应

英文摘要:

For $m\in \mathbb{N}, m\geq 1,$ we determine the irreducible components of the $m-th$ jet scheme of a normal toric surface $S.$ We give formulas for the number of these components and their dimensions. When $m$ varies, these components give rise to projective systems, to which we associate a weighted graph. We prove that the data of this graph is equivalent to the data of the analytical type of $S.$ Besides, we classify these irreducible components by an integer invariant that we call index of speciality. We prove that for $m$ large enough, the set of components with index of speciality $1,$ is in 1-1 correspondance with the set of exceptional divisors that appear on the minimal resolution of $S.$

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