The number of Dirac-weighted eigenvalues of Sturm-Liouville equations with integrable potentials and an application to inverse problems

The number of Dirac-weighted eigenvalues of Sturm-Liouville equations with integrable potentials and an application to inverse problems
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具有可积势的 Sturm-Liouville 方程的狄拉克加权特征值的数量及其在反演问题中的应用

DOI:
10.1002/mma.7547
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发表时间:
2021-01
期刊:
Mathematical Methods in the Applied Science
影响因子:
--
通讯作者:
綦建刚
綦建刚
中科院分区:
其他
文献类型:
--
作者:
陈潇;綦建刚

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在本文中,我们进一步Meirong Zhang,et al.的工作,计算了具有一般可积势和Dirac权的Sturm-Liouville方程在Dirichlet边界条件下的加权特征值的个数。证明了对于具有一般可积势的Sturm-Liouville方程,若其权是n个Dirac Delta函数的正线性组合,则至多有n个Dirac Delta函数(可能小于$n$,甚至是$0$)不同的真实的Dirichlet特征值,或者每个复数都是Dirichlet特征值;特别地,在某些尖锐的条件下,Dirichlet特征值的数量正好是$n$。本文的主要方法是对带Dirac权的Sturm-Liouville问题引入特征矩阵和特征多项式的概念,并提出了一种计算特征值的通用直接算法。作为应用,研究了一类具有单Dirac分布权的Sturm-Liouville方程的Dirichelt反问题.
In this paper, we further Meirong Zhang, et al.'s work by computing the number of weighted eigenvalues for Sturm-Liouville equations, equipped with general integrable potentials and Dirac weights, under Dirichlet boundary condition. We show that, for a Sturm-Liouville equation with a general integrable potential, if its weight is a positive linear combination of $n$ Dirac Delta functions, then it has at most $n$ (may be less than $n$, or even be $0$) distinct real Dirichlet eigenvalues, or every complex number is a Dirichlet eigenvalue; in particular, under some sharp condition, the number of Dirichlet eigenvalues is exactly $n$. Our main method is to introduce the concepts of characteristics matrix and characteristics polynomial for Sturm-Liouville problem with Dirac weights, and put forward a general and direct algorithm used for computing eigenvalues. As an application, a class of inverse Dirichelt problems for Sturm-Liouville equations involving single Dirac distribution weights is studied.
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