The Dirichlet Problem on Quadratic Surfaces

Details The Dirichlet Problem on Quadratic Surfaces The Dirichlet Problem on Quadratic Surfaces

2002-12-26

arxiv.org/abs/math/0212342v1

Mathematics

Classical Analysis and ODEs

14 pages. For additional information, including a Mathematica package that implements the algorithm developed in this paper, s

Scientific paper

We give a fast, exact algorithm for solving Dirichlet problems with polynomial boundary functions on quadratic surfaces in R^n such as ellipsoids, elliptic cylinders, and paraboloids. To produce this algorithm, first we show that every polynomial in R^n can be uniquely written as the sum of a harmonic function and a polynomial multiple of a quadratic function, thus extending a theorem of Ernst Fischer. We then use this decomposition to reduce the Dirichlet problem to a manageable system of linear equations. The algorithm requires differentiation of the boundary function, but no integration. We also show that the polynomial solution produced by our algorithm is the unique polynomial solution, even on unbounded domains such as elliptic cylinders and paraboloids.

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