Abstract
In this paper, we present a collocation method for the approximate solution of two-dimensional Hammerstein integral equations over polygonal regions in \({\mathbb R}^{2}\). For a reformulation of the equation, we triangulate the polygonal region and use a special type of quadratic interpolation on each triangle. This produces a quadrature formula with a higher degree of precision than expected, leading to a numerical method that is superconvergent at the collocation nodes. We prove the convergence of the method and give error estimates. The implementation is also discussed and the applicability of the proposed scheme is presented on numerical examples. The paper concludes with a discussion on the efficiency of the proposed method, also highlighting some ideas for future research in this area.

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Micula, S. Numerical solution of two-dimensional Hammerstein integral equations via quadratic spline collocation. Numer Algor 93, 1225–1241 (2023). https://doi.org/10.1007/s11075-022-01465-x
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DOI: https://doi.org/10.1007/s11075-022-01465-x