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arXiv 1407.2265math.AG
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广义超几何方程在Frobenius基上的单值性

Monodromy of the generalized hypergeometric equation in the Frobenius basis

Leslie Molag

摘要:

我们考虑了广义超几何方程\begin{equation*} \big[z(θ+α_{1})\cdots (θ+α_{n})-(θ+β_{1}-1)\cdots (θ+β_{n}-1)\big]f(z) = 0\text{, where }θ= z d/dz, \end{equation*}在一个合适的基上的单值群,该基与Frobenius基密切相关。我们特别注意的最大单幂的情况下,$β_{1}=\ldots=β_{n}=1$,并提出了一个定理,使我们能够确定相应的单值矩阵的形式的情况下,$(X-e^{-2πiα_{1}})\cdots (X-e^{-2πiα_{n}})$是分圆多项式的产品。

英文摘要:

We consider monodromy groups of the generalized hypergeometric equation \begin{equation*} \big[z(θ+α_{1})\cdots (θ+α_{n})-(θ+β_{1}-1)\cdots (θ+β_{n}-1)\big]f(z) = 0\text{, where }θ= z d/dz, \end{equation*} in a suitable basis, closely related to the Frobenius basis. We pay particular attention to the maximally unipotent case, where $β_{1}=\ldots=β_{n}=1$, and present a theorem that enables us to determine the form of the corresponding monodromy matrices in the case where $(X-e^{-2πiα_{1}})\cdots (X-e^{-2πiα_{n}})$ is a product of cyclotomic polynomials.

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