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arXiv math/0006176math.NTmath.AG
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关于Siegel模形式生成的微分场的超越度

On the transcendence degree of the differential field generated by Siegel modular forms

Daniel Bertrand, Wadim Zudilin

摘要:

椭圆模函数满足一个三阶代数微分方程,且不满足低阶方程,这是一个经典事实。我们展示了如何推广到西格尔模函数的任意程度。其关键思想是,它们所满足的偏微分方程是由高斯-马宁联络所支配的,其单值群是众所周知的。模θ函数对我们的结果提供了一个具体的解释,并且我们在2次的情况下详细研究了它们的微分性质。

英文摘要:

It is a classical fact that the elliptic modular functions satisfies an algebraic differential equation of order 3, and none of lower order. We show how this generalizes to Siegel modular functions of arbitrary degree. The key idea is that the partial differential equations they satisfy are governed by Gauss--Manin connections, whose monodromy groups are well-known. Modular theta functions provide a concrete interpretation of our result, and we study their differential properties in detail in the case of degree 2.

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