Second order difference equations and discrete orthogonal polynomials of two variables

Details Second order difference equations and discrete orthogonal polynomials of two variables Second order difference equations and discrete orthogonal polynomials of two variables

2004-07-27

arxiv.org/abs/math/0407447v1

Mathematics

Classical Analysis and ODEs

19 pages

Scientific paper

The second order partial difference equation of two variables $ \CD u:= A_{1,1}(x) \Delta_1 \nabla_1 u + A_{1,2}(x) \Delta_1 \nabla_2 u + A_{2,1}(x) \Delta_2 \nabla_1 u + A_{2,2}(x) \Delta_2 \nabla_2 u & \qquad \qquad \qquad \qquad + B_1(x) \Delta_1 u + B_2(x) \Delta_2 u = \lambda u, $ is studied to determine when it has orthogonal polynomials as solutions. We derive conditions on $\CD$ so that a weight function $W$ exists for which $W \CD u$ is self-adjoint and the difference equation has polynomial solutions which are orthogonal with respect to $W$. The solutions are essentially the classical discrete orthogonal polynomials of two variables.

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