Separation of variables and combinatorics of linearization coefficients of orthogonal polynomials

Details Separation of variables and combinatorics of linearization coefficients of orthogonal polynomials Separation of variables and combinatorics of linearization coefficients of orthogonal polynomials

2011-12-05

arxiv.org/abs/1112.0970v1

Mathematics

Classical Analysis and ODEs

46 pages

Scientific paper

We propose a new approach to the combinatorial interpretations of linearization coefficient problem of orthogonal polynomials. We first establish a difference system and then solve it combinatorially and analytically using the method of separation of variables. We illustrate our approach by applying it to determine the number of perfect matchings, derangements, and other weighted permutation problems. The separation of variables technique naturally leads to integral representations of combinatorial numbers where the integrand contains a product of one or more types of orthogonal polynomials. This also establishes the positivity of such integrals.

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