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arXiv 1003.4612math.CA
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半经典Sobolev正交多项式的一般方法

The semiclassical--Sobolev orthogonal polynomials: a general approach

R. S. Costas-Santos, J. J. Moreno-Balcázar

摘要:

当多项式序列$(Q^{(λ)}_n)$关于内积$$ <p, r>_S=<{\bf u} ,{p\, r}> +λ<{\bf u}, {{\mathscr D}p \,{\mathscr D}r}>, $$正交时,我们说它是半经典Sobolev多项式序列,其中${\bf u}$是半经典线性泛函,${\mathscr D}$是微分,差分或$q$ -差分算子,$λ$是正常数。本文得到了这类多项式的代数和微分/差分性质以及它们与关于半经典泛函$\bf u$正交的多项式序列之间的代数关系。本文的主要目的是给出一个一般的方法来研究多项式正交于上述非标准内积,无论类型的运营商${\mathscr D}$考虑。最后,我们通过将这些结果应用于一些已知的Sobolev正交多项式族以及本文首次引入的一些新的Sobolev正交多项式族来说明我们的结果。

英文摘要:

We say that the polynomial sequence $(Q^{(λ)}_n)$ is a semiclassical Sobolev polynomial sequence when it is orthogonal with respect to the inner product $$ <p, r>_S=<{\bf u} ,{p\, r}> +λ<{\bf u}, {{\mathscr D}p \,{\mathscr D}r}>, $$ where ${\bf u}$ is a semiclassical linear functional, ${\mathscr D}$ is the differential, the difference or the $q$--difference operator, and $λ$ is a positive constant. In this paper we get algebraic and differential/difference properties for such polynomials as well as algebraic relations between them and the polynomial sequence orthogonal with respect to the semiclassical functional $\bf u$. The main goal of this article is to give a general approach to the study of the polynomials orthogonal with respect to the above nonstandard inner product regardless of the type of operator ${\mathscr D}$ considered. Finally, we illustrate our results by applying them to some known families of Sobolev orthogonal polynomials as well as to some new ones introduced in this paper for the first time.

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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