Investigation of the Asymptotics of the Eigenvalues of a Second-Order Quasidifferential Boundary Value Problem

IF 0.5 Q3 MATHEMATICS Russian Mathematics Pub Date : 2024-06-25 DOI:10.3103/s1066369x24700154
M. Yu. Vatolkin
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Abstract

We construct the asymptotics of the eigenvalues for a quasidifferential Sturm–Liouville boundary value problem on eigenvalues and eigenfunctions considered on a segment \(J = [a,b]\), with the boundary conditions of type I on the left and right, that is, for a problem of the form (in the explicit notation) \({{p}_{{22}}}(t)\left( {{{p}_{{11}}}(t)\left( {{{p}_{{00}}}(t)x(t)} \right){\kern 1pt} '\; + {{p}_{{10}}}(t)\left( {{{p}_{{00}}}(t)x(t)} \right)} \right){\kern 1pt} '\; + {{p}_{{21}}}(t)\left( {{{p}_{{11}}}(t)\left( {{{p}_{{00}}}(t)x(t)} \right){\kern 1pt} '\; + {{p}_{{10}}}(t)\left( {{{p}_{{00}}}(t)x(t)} \right)} \right)\) \( + \;{{p}_{{20}}}(t)\left( {{{p}_{{00}}}(t)x(t)} \right) = - \lambda \left( {{{p}_{{00}}}(t)x(t)} \right)\;\;(t \in J = [a,b]),\) \({{p}_{{00}}}(a)x(a) = {{p}_{{00}}}(b)x(b) = 0.\) The requirements for smoothness of the coefficients (that is, functions \({{p}_{{ik}}}( \cdot ):J \to \mathbb{R}\), \(k \in 0:i\), \(i \in 0:2\)) in the equation are minimal, namely, these are as follows: the functions \({{p}_{{ik}}}( \cdot ):J \to \mathbb{R}\) are such that the functions \({{p}_{{00}}}( \cdot )\) and \({{p}_{{22}}}( \cdot )\) are measurable, nonnegative, almost every finite, and almost everywhere nonzero and the functions \({{p}_{{11}}}( \cdot )\) and \({{p}_{{21}}}( \cdot )\) also are nonnegative on the segment \(J,\) and, in addition, the functions \({{p}_{{11}}}( \cdot )\) and \({{p}_{{22}}}( \cdot )\) are essentially bounded on \(J,\) the functions \(\frac{1}{{{{p}_{{11}}}( \cdot )}},\;\;\frac{{{{p}_{{10}}}( \cdot )}}{{{{p}_{{11}}}( \cdot )}},\;\;\frac{{{{p}_{{20}}}( \cdot )}}{{{{p}_{{22}}}( \cdot )}},\;\;\frac{{{{p}_{{21}}}( \cdot )}}{{{{p}_{{22}}}( \cdot )}},\;\;\frac{1}{{\min \{ {{p}_{{11}}}(t){{p}_{{22}}}(t),1\} }}\) are summable on the segment \(J.\) The function \({{p}_{{20}}}( \cdot )\) acts as a potential. It is proved that under the condition of nonoscillation of a homogeneous quasidifferential equation of the second order on \(J\), the asymptotics of the eigenvalues of the boundary value problem under consideration has the form \({{\lambda }_{k}} = {{(\pi k)}^{2}}\left( {D + O({\text{1/}}{{k}^{2}})} \right)\) as \(k \to \infty ,\) where \(D\) is a real positive constant defined in some way.

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二阶准微分边值问题特征值渐近性研究
Abstract We construct the asymptics of the eigenvalues for a quasidifferential Sturm-Liouville boundary value problem on eigenvalues and eigenfunctions considered on a segment \(J = [a,b]\)、左侧和右侧为 I 型边界条件,即对于形式为(显式符号)\({{p}_{{22}}}(t)\left( {{{p}_{{11}}}(t)\left( {{{p}_{00}}}(t)x(t)}\right){\kern 1pt} '\;+ {{p}_{{10}}}(t)\left( {{p}_{{00}}}(t)x(t)} \right)} \right){\kern 1pt} '\;+ {{p}_{{21}}}(t)\left( {{p}_{{11}}}(t)\left( {{p}_{{00}}}(t)x(t)} \right){\kern 1pt} '\; + {{p}_{{10}}}(t)\left( {{p}_{00}}}(t)x(t)} \right)} \)( + \;{{p}_{20}}}(t)\left( {{p}_{00}}}(t)x(t)} \right) = - \lambda \left( {{p}_{00}}}(t)x(t)} \right)\;\;(t \in J = [a,b]),\)\({{p}_{00}}}(a)x(a) = {{p}_{00}}}(b)x(b) = 0.\方程中系数(即函数 \({{p}_{{ik}}}( \cdot ):J \to \mathbb{R}\), \(k \in 0:i\), \(i \in 0:2\)) 的平稳性要求是最低的,即如下:函数 \({{p}_{{ik}}}( \cdot ):J \to \mathbb{R}\) 是这样的:函数 \({{p}_{{00}}}( \cdot )\) 和 \({{p}_{{22}}}( \cdot )\) 是可测量的、非负的、几乎处处有限的、函数({{p}_{{11}}}( \cdot ))和函数({{p}_{21}}}( \cdot ))在线段 \(J.) 上也是非负的、\此外,函数 \({{p}_{{11}}}( \cdot )\) 和 \({{p}_{{22}}}( \cdot )\) 在 \(J,\) 上基本上是有界的;函数 \(\frac{1}{{{{p}_{{11}}}( \cdot )}},\;\;\frac{{{{p}_{{21}}}( \cdot )}}{{{{p}_{{22}}}( \cdot )}},\;\;\frac{1}{{min \{{{p}_{{11}}}(t){{p}_{{22}}}(t),1\}函数 \({{p}_{{20}}}( \cdot )\) 充当了势。证明了在\(J\)上的二阶均质准微分方程的非振荡条件下,所考虑的边界值问题的特征值的渐近形式为({{\lambda }_{k}} = {{(\pi k)}^{2}} (left( {D + O({\text{1/}}{{k}^{2}}) })。\其中 \(D\) 是以某种方式定义的实正常数。
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来源期刊
Russian Mathematics
Russian Mathematics MATHEMATICS-
CiteScore
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期刊介绍: Russian Mathematics  is a peer reviewed periodical that encompasses the most significant research in both pure and applied mathematics.
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