Advancements in nonlinear exponential sampling: convergence, quantitative analysis and Voronovskaya-type formula
Functional Analysis
2025-08-12 v1
Abstract
In this paper, we introduce the nonlinear exponential Kantorovich sampling series. We establish pointwise and uniform convergence properties and a nonlinear asymptotic formula of the Voronovskaja-type given in terms of the limsup. Furthermore, we extend these convergence results to Mellin-Orlicz spaces with respect to the logarithmic (Haar) measure. Quantitative results are also given, using the log-modulus of continuity and the log-modulus of smoothness, respectively, for log-uniformly continuous functions and for functions in Mellin-Orlicz spaces. Consequently, the qualitative order of convergence can be obtained in case of functions belonging to suitable Lipschitz (log-H\"olderian) classes.
Cite
@article{arxiv.2411.15475,
title = {Advancements in nonlinear exponential sampling: convergence, quantitative analysis and Voronovskaya-type formula},
author = {Danilo Costarelli and Mariarosaria Natale},
journal= {arXiv preprint arXiv:2411.15475},
year = {2025}
}