Abstract
Let Ω be an open, simply connected, and bounded region in ℝd, d ≥ 2, and assume its boundary ∂Ω is smooth. Consider solving the elliptic partial differential equation − Δu + γu = f over Ω with a Neumann boundary condition. The problem is converted to an equivalent elliptic problem over the unit ball B, and then a spectral method is given that uses a special polynomial basis. In the case the Neumann problem is uniquely solvable, and with sufficiently smooth problem parameters, the method is shown to have very rapid convergence. Numerical examples illustrate exponential convergence.
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Communicated by Yuesheng Xu.
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Atkinson, K., Hansen, O. & Chien, D. A spectral method for elliptic equations: the Neumann problem. Adv Comput Math 34, 295–317 (2011). https://doi.org/10.1007/s10444-010-9154-3
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DOI: https://doi.org/10.1007/s10444-010-9154-3