On the approximation of Weierstrass function via superoscillations
Classical Analysis and ODEs
2026-03-09 v1 Complex Variables
Abstract
The Weierstrass function is a classic example of a continuous nowhere differentiable function, defined as a sum of high-frequency complex exponentials. In this paper, we follow a suggestion of M.V. Berry and study the convergence properties of Berry's superoscillating approximation to the truncated Weierstrass function. We provide sharp, explicit error estimates for this approximation and we analyze the subtle convergence properties of the associated double limits.
Cite
@article{arxiv.2603.05580,
title = {On the approximation of Weierstrass function via superoscillations},
author = {Fabrizio Colombo and Irene Sabadini and Daniele C. Struppa},
journal= {arXiv preprint arXiv:2603.05580},
year = {2026}
}