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arXiv 1807.09640math.RT
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单奇点的根系与形变商

Root Systems and Quotients of Deformations of Simple Singularities

Antoine Caradot

摘要:

本文研究了简单奇点的形变分量,并试图用简单根系的子系统来刻画它们。非齐次型$B_r$($r \geq 2$)、$C_r$($r \geq 3$)、$F_4$或$G_2$的简单奇点的半泛变形与相应Dynkin图的自然对称性的商是齐次型$X = D_s$、$E_6$或$E_7$的简单奇点的变形,但不再是半泛的。因此,并不是所有的$X$子图都表现为变形纤维的奇异构型。本文提出了一个关于$X$型根系的子根系的奇异构型类型的猜想。然后证明了该猜想对于$B_2$,$B_3$,$C_3$,$F_4$和$G_2$类型的正确性.

英文摘要:

In this article we study quotients of deformations of simple singularities, and attempt to characterize them in terms of subsystems of simple root systems. The quotient of a semiuniversal deformation of a simple singularity of inhomogeneous type $B_r$ ($r \geq 2$), $C_r$ ($r \geq 3$), $F_4$ or $G_2$ by the natural symmetry of the associated Dynkin diagram is a deformation of a simple singularity of homogeneous type $X = D_s$, $E_6$ or $E_7$, but not semiuniversal anymore. Therefore not all subdiagrams of $X$ appear as singular configurations of the fibers of the deformation. We propose a conjecture for the types of singular configurations in terms of sub-root systems of a root system of type $X$. The conjecture is then proved for the types $B_2$, $B_3$, $C_3$, $F_4$ and $G_2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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