Gauusian quadrature for multiple orthogonal polynomials

Details Gauusian quadrature for multiple orthogonal polynomials Gauusian quadrature for multiple orthogonal polynomials

2004-03-31

arxiv.org/abs/math/0403533v1

Mathematics

Classical Analysis and ODEs

16 pages

Scientific paper

We study multiple orthogonal polynomials of type I and type II which have orthogonality conditions with respect to r measures. These polynomials are connected by their recurrence relation of order r+1. First we show a relation with the eigenvalue problem of a banded lower Hessenberg matrix L_n, containing the recurrence coefficients. As a consequence, we easily find that the multiple orthogonal polynomials of type I and type II satisfy a generalized Christoffel-Darboux identity. Furthermore, we explain the notion of multiple Gaussian quadrature (for proper multi-indices), which is an extension of the theory of Gaussian quadrature for orthogonal polynomials and was introduced by C. F. Borges. In particular we show that the quadrature points and quadrature weights can be expressed in terms of the eigenvalue problem of L_n.

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