用Dessins d'Enfants计数积分Lamé方程
Counting Integral Lamé Equations by Means of Dessins d'Enfants
摘要:
对于给定的$n \in \Z$和$N \in \N$,我们得到了指数为$n$和序为$2N$的射影单值群的Lamé方程(模标量等价)个数的一个显式公式.这是通过执行与Belyi覆盖相关的“dessins d'enfants”的组合来完成的,Belyi覆盖通过拉回将超几何方程转换为Lamé方程。
英文摘要:
We obtain an explicit formula for the number of Lamé equations (modulo scalar equivalence) with index $n$ and projective monodromy group of order $2N$, for given $n \in \Z$ and $N \in \N$. This is done by performing the combinatorics of the `dessins d'enfants' associated to the Belyi covers which transform hypergeometric equations into Lamé equations by pull-back.
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