Universitat de Barcelona
2021-02-03T09:04:50Z
2023-01-06T06:10:22Z
2021-01-06
2021-02-03T09:04:51Z
A sharp version of a recent inequality of Kovalev and Yang on the ratio of the $(H^1)^\ast$ and $H^4$ norms for certain polynomials is obtained. The inequality is applied to establish a sharp and tractable sufficient condition for the Wirtinger derivatives at the origin for harmonic self-maps of the unit disc which fix the origin.
Article
Accepted version
English
Espais de Hardy; Anàlisi harmònica; Hardy spaces; Harmonic analysis
Elsevier
Versió postprint del document publicat a: https://doi.org/10.1016/j.jmaa.2020.124908
Journal of Mathematical Analysis and Applications, 2021, vol. 497, num. 2
https://doi.org/10.1016/j.jmaa.2020.124908
cc-by-nc-nd (c) Elsevier, 2021
http://creativecommons.org/licenses/by-nc-nd/3.0/es
