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arXiv · 2606.27178

De la Vallée Poussin type approximation for solving some Fredholm integral equations

Domenico Mezzanotte·Donatella Occorsio·Mario Pezzella·Woula Themistoclakis
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Abstract

In the present paper, we introduce a numerical method for second-kind Fredholm integral equations (FIEs) based on de la Vallée Poussin-type (VP) polynomial approximations at Jacobi zeros. This class of approximations offers several advantages over classical Lagrange interpolation at the same nodes. In particular, it guarantees uniformly bounded Lebesgue constants in suitable weighted function spaces and provides near-best uniform approximation for functions in these spaces, while also significantly mitigating the Gibbs phenomenon. We show how these properties can be exploited in the numerical solution of FIEs. In particular, the proposed approach effectively handles functions with possible algebraic endpoint singularities and kernel functions featuring weak singularities or highly oscillatory behavior. Under suitable assumptions, we prove stability and convergence of the method in weighted uniform spaces. Furthermore, we develop an efficient implementation based on the solution of a well-conditioned linear system. Numerical results confirm the theoretical error estimates and show that the proposed method achieves higher local accuracy than the corresponding Lagrange-based projection method.

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Domenico Mezzanotte, Donatella Occorsio, Mario Pezzella, Woula Themistoclakis. 2026-06-25. De la Vallée Poussin type approximation for solving some Fredholm integral equations. https://arxiv.org/abs/2606.27178

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