A triangular hierarchical Poincaré-Steklov scheme achieves O(N log N) fast direct solves for surface PDEs with spectral accuracy on unstructured meshes.
Koornwinder,Two-variable analogues of the classical orthogonal polynomials, in Theory and application of special functions, Elsevier, 1975, pp
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A High-Order Fast Direct Solver for Surface PDEs on Triangles
A triangular hierarchical Poincaré-Steklov scheme achieves O(N log N) fast direct solves for surface PDEs with spectral accuracy on unstructured meshes.