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Title: The eigenvalues of symmetric Sturm-Liouville problem and inverse potential problem, based on special matrix and product formula (English)
Author: Liu, Chein-Shan
Author: Li, Botong
Language: English
Journal: Applications of Mathematics
ISSN: 0862-7940 (print)
ISSN: 1572-9109 (online)
Volume: 69
Issue: 3
Year: 2024
Pages: 355-372
Summary lang: English
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Category: math
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Summary: The Sturm-Liouville eigenvalue problem is symmetric if the coefficients are even functions and the boundary conditions are symmetric. The eigenfunction is expressed in terms of orthonormal bases, which are constructed in a linear space of trial functions by using the Gram-Schmidt orthonormalization technique. Then an $n$-dimensional matrix eigenvalue problem is derived with a special matrix ${\bf A}:=[a_{ij}]$, that is, $a_{ij}=0$ if $i+\nobreak j$ is odd.\looseness +1 \endgraf Based on the product formula, an integration method with a fictitious time, namely the fictitious time integration method (FTIM), is developed to obtain the higher-index eigenvalues. Also, we recover the symmetric potential function $q(x)$ in the Sturm-Liouville operator by specifying a few lower-index eigenvalues, based on the product formula and the Newton iterative method. (English)
Keyword: symmetric Sturm-Liouville problem
Keyword: inverse potential problem
Keyword: special matrix eigenvalue problem
Keyword: product formula
Keyword: fictitious time integration method
MSC: 34A55
MSC: 34B24
DOI: 10.21136/AM.2024.0005-21
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Date available: 2024-05-17T07:47:48Z
Last updated: 2024-05-20
Stable URL: http://hdl.handle.net/10338.dmlcz/152354
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