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arXiv · 2411.14933

Fast-Decaying Polynomial Reproduction

Stefano De Marchi·Giacomo Cappellazzo
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Abstract

Polynomial reproduction plays a crucial role in deriving error estimates for various approximation schemes. In particular, local polynomial reproduction is a key ingredient in both error estimation and stability analysis. However, for certain computationally relevant methods, such as Rescaled Localized Radial Basis Functions (RL-RBF), this requirement constitutes a limitation. To enable the analysis of a broader class of approximation methods in a unified and efficient manner, the present work introduces a framework based on fast-decaying polynomial reproduction. In this approach, we do not restrict ourselves to compactly supported basis functions. Instead, we allow the basis functions to decay to zero at infinity, with the decay rate controlled as a function of the separation distance. The adoption of fast-decaying polynomial reproduction yields stable and convergent approximation schemes. These methods can achieve smoothness when used in conjunction with moving least squares. All theoretical results presented in this paper regarding the rate of convergence, the Lebesgue constant and the smoothness of the approximant have been numerically validated, including in the multivariate setting.

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Stefano De Marchi, Giacomo Cappellazzo. 2024-11-22. Fast-Decaying Polynomial Reproduction. https://arxiv.org/abs/2411.14933

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