Year: 2025
Type: preprint
Abstract: We prove convergence of the spectral element method for piecewise polynomial collocation applied to periodic boundary value problems for functional differential equations. In particular, we prove that the numerical collocation solution approximates the true solution with accuracy of order $\mathrm{e}^{-ηm}$ for some $η>0$ and increasing degree $m$ of the polynomials, provided that the true solution is analytical. This includes a case that is common in applications: differential equations where the right-hand side depends on a finite number of delayed arguments with parametric delays and real analytic coefficients. For state-dependent delays the spectral element method also converges under mild regularity assumptions, although analyticity of the solution cannot be trivially inferred from analyticity of the coefficients. In order to extend our convergence results to this case, we introduce the concept of extended local Lipschitz continuity of the right-hand side.
Source: arXiv (Cornell University)
Authors: andò, Alessia, Sieber, Jan
Institutions: University of Udine, University of Exeter
Language: English
Subfield: Numerical Analysis
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7077048532
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