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arXiv math-ph/0610071math-phmath.GMmath.MP
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正交多项式的非线性积分方程

Nonlinear Integral-Equation Formulation of Orthogonal Polynomials

Carl M. Bender, E. Ben-Naim

摘要:

研究了非线性积分方程P(x)= \int_a lpha^beta dy w(y)P(y)P(x+y).证明了对于给定的函数w(x),方程存在无穷多个多项式解P(x).对于多项式解,该非线性积分方程简化为多项式系数的耦合线性代数方程的有限集合。有趣的是,多项式解的集合关于测度x w(x)是正交的。非线性积分方程可以用一种简单而紧凑的方式来指定所有的正交多项式。这个积分方程提供了一个自然的车辆扩展到复域的正交多项式的理论。积分方程的推广进行了讨论。

英文摘要:

The nonlinear integral equation P(x)=\int_alpha^beta dy w(y) P(y) P(x+y) is investigated. It is shown that for a given function w(x) the equation admits an infinite set of polynomial solutions P(x). For polynomial solutions, this nonlinear integral equation reduces to a finite set of coupled linear algebraic equations for the coefficients of the polynomials. Interestingly, the set of polynomial solutions is orthogonal with respect to the measure x w(x). The nonlinear integral equation can be used to specify all orthogonal polynomials in a simple and compact way. This integral equation provides a natural vehicle for extending the theory of orthogonal polynomials into the complex domain. Generalizations of the integral equation are discussed.

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