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arXiv 0905.1196math.AGmath.NT
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关于正特征的全纯多微分

On holomorphic polydifferentials in positive characteristic

Sotiris Karanikolopoulos

摘要:

本文研究了定义在特征$p>0$代数闭域上的曲线的函数域的全纯$m$ -(多)微分空间$Ω(m)$,当$G$是$p^n$阶循环或初等阿贝尔群时;当基域是有理数时,我们给出每种情况的基,引入Boseck不变量,并利用Boseck不变量对$Ω(m)$的$G$模结构进行了初步探讨.最后一个计算是在循环情况下对基域没有任何限制,而在初等阿贝尔情况下,假设基域是有理数的。给出了它在计算具有自同构的曲线的变形函子的切空间中的应用。

英文摘要:

In this paper we study the space $Ω(m)$, of holomorphic $m$-(poly)differentials of a function field of a curve defined over an algebraically closed field of characteristic $p>0$ when $G$ is cyclic or elementary abelian group of order $p^n$; we give bases for each case when the base field is rational, introduce the Boseck invariants and give an elementary approach to the $G$ module structure of $Ω(m)$ in terms of Boseck invariants. The last computation is achieved without any restriction on the base field in the cyclic case, while in the elementary abelian case it is assumed that the base field is rational. An application to the computation of the tangent space of the deformation functor of curves with automorphisms is given.

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