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arXiv 0803.3166math.SPmath.FA
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具分布势的Sturm-Liouville算子的等收敛定理及等收敛速度

Equiconvergence theorems for Sturm--Liouville operators with distribution potentials^ the rate of equiconvergence

I. V. Sadovnichaya

摘要:

本文考虑一类Sturm-Liouville算子$Ly=-y''+qy$在具有Dirichlet边界条件的$L_2[0,π]$中的情形.我们假定,势$q$是复值的,属于Sobolev空间$W_2^θ[0,π]$,$θ\in(-1,-1/2$ .在Savchuk A.M.和Shkalikov A.A.的论文中成功地定义了这种算子。证明了这类算子具有离散谱,记为$\{λ_n\}$和$\limλ_n=+\infty$。除此之外,大多数都很简单。本征函数形成$L_2[0,π]$中的Riesz基。研究了该系统和三角系统$\{\sin(nt)\}_1^\infty$的级数的$[0,π]$等敛性的一致性.不仅得到了等收敛的一个定理,而且给出了等收敛率的估计。

英文摘要:

We consider a Sturm--Liouville operator $Ly=-y''+qy$ in $L_2[0,π]$ with Dirichlet boundary conditions. We assume, that the potential $q$ is complex valued and belongs to Sobolev space $W_2^θ[0,π]$, $θ\in(-1,-1/2$. This operators were successfully defined in papers of Savchuk A.M. and Shkalikov A.A. There were also shown, that theese operators have a discrete spectrum, which we denote by $\{λ_n\}$, and $\limλ_n=+\infty$. All but finitely many of them are simple. The eigenfunctions form the Riesz basis in $L_2[0,π]$. We investigate a uniform on $[0,π]$ equiconvergence of series for this system and for trigonometric system $\{\sin(nt)\}_1^\infty$. We obtain not only a theorems of equiconvergence, but also estimate a rate of this equiconvergence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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