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• W3204702256 abstract "Motivated by comparing the convergence behavior of Gegenbauer projections and best approximations, we study the optimal rate of convergence for Gegenbauer projections in the maximum norm. We show that the rate of convergence of Gegenbauer projections is the same as that of best approximations under conditions of the underlying function is either analytic on and within an ellipse and $lambdaleq0$ or differentiable and $lambdaleq1$, where $lambda$ is the parameter in Gegenbauer projections. If the underlying function is analytic and $lambda>0$ or differentiable and $lambda>1$, then the rate of convergence of Gegenbauer projections is slower than that of best approximations by factors of $n^{lambda}$ and $n^{lambda-1}$, respectively. An exceptional case is functions with endpoint singularities, for which Gegenbauer projections and best approximations converge at the same rate for all $lambda>-1/2$. For functions with interior or endpoint singularities, we provide a theoretical explanation for the error localization phenomenon of Gegenbauer projections and for why the accuracy of Gegenbauer projections is better than that of best approximations except in small neighborhoods of the critical points. Our analysis provides fundamentally new insight into the power of Gegenbauer approximations and related spectral methods." @default.
• W3204702256 created "2021-10-11" @default.
• W3204702256 creator A5032470217 @default.
• W3204702256 date "2020-08-02" @default.
• W3204702256 modified "2023-09-26" @default.
• W3204702256 title "Optimal rates of convergence and error localization of Gegenbauer projections" @default.
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• W3204702256 doi "https://doi.org/10.48550/arxiv.2008.00584" @default.
• W3204702256 hasPublicationYear "2020" @default.
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