Stiefel filters
Complex Variables
2024-11-08 v1
Abstract
The best uniform rational approximation of the Sign function on two intervals separated by zero was explicitly found by E.I. Zolotar\"ev in 1877. The natural extension of this problem to three bands was solved by E.Stiefel in 1961. We indicate the solutions overlooked by the prominent geometer and study their properties.
Cite
@article{arxiv.2411.04146,
title = {Stiefel filters},
author = {Andrei Bogatyrev},
journal= {arXiv preprint arXiv:2411.04146},
year = {2024}
}
Comments
13 pages, 5 figures