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arXiv 2004.05866math-phmath.FAmath.MP
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低维离散拉普拉斯算子预解式的超几何表示

Hypergeometric expression for the resolvent of the discrete Laplacian in low dimensions

Kenichi Ito, Arne Jensen

摘要:

我们给出了正方形格点上离散拉普拉斯算子的预解式的一个显式公式,并计算了其在低维阈值附近的渐近展开式。作为副产品,我们获得了离散拉普拉斯算子基本解的封闭公式。对于证明,我们表示的预解式在一般的尺寸方面的Appell-Lauricella超几何函数的类型$C$外的磁盘包围的频谱。在低维情况下,它简化为一个广义超几何函数,对于它,某些变换公式可用于所需的展开。

英文摘要:

We present an explicit formula for the resolvent of the discrete Laplacian on the square lattice, and compute its asymptotic expansions around thresholds in low dimensions. As a by-product we obtain a closed formula for the fundamental solution to the discrete Laplacian. For the proofs we express the resolvent in a general dimension in terms of the Appell--Lauricella hypergeometric function of type $C$ outside a disk encircling the spectrum. In low dimensions it reduces to a generalized hypergeometric function, for which certain transformation formulas are available for the desired expansions.

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