Dirichlet and Neumann Problems for String Equation, Poncelet Problem and Pell-Abel Equation
Vladimir P. Burskii, Alexei S. Zhedanov
Abstract
We consider conditions for uniqueness of the solution of the Dirichlet or the Neumann problem for 2-dimensional wave equation inside of bi-quadratic algebraic curve. We show that the solution is non-trivial if and only if corresponding Poncelet problem for two conics associated with the curve has periodic trajectory and if and only if corresponding Pell-Abel equation has a solution.
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