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arXiv 1408.0883math-phmath.MP
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薛定谔方程任意本征函数列的Wronskian的振动性定理

Oscillation theorems for the Wronskian of an arbitrary sequence of eigenfunctions of Schrödinger's equation

M. Ángeles García-Ferrero, David Gómez-Ullate

摘要:

阿德勒的工作提供了必要和充分条件的朗斯基的一个给定序列的本征函数的薛定谔方程有常数符号在其域的定义。我们扩展了这一结果,给出明确的公式的任意序列的特征函数的朗斯基的实零点的数量。我们的结果特别适用于经典正交多项式的Wronskians,从而推广了经典的结果卡林和SzegIgn。我们的公式在非常温和的条件下成立,这些条件被认为适用于参数的一般值。在埃尔米特的情况下,我们的研究结果可以证明最近制定的费尔德等人。

英文摘要:

The work of Adler provides necessary and sufficient conditions for the Wronskian of a given sequence of eigenfunctions of Schrödinger's equation to have constant sign in its domain of definition. We extend this result by giving explicit formulas for the number of real zeros of the Wronskian of an arbitrary sequence of eigenfunctions. Our results apply in particular to Wronskians of classical orthogonal polynomials, thus generalizing classical results by Karlin and Szegő. Our formulas hold under very mild conditions that are believed to hold for generic values of the parameters. In the Hermite case, our results allow to prove some conjectures recently formulated by Felder et al.

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