应兰州大学数学与统计学院邀请, 德国Jena大学Winfried Sickel教授将于2025年10月21日-10月24日访问兰州大学并于10月22日上午作学术报告, 欢迎全校师生参加。

报告题目：On the regularity of products of distributions in Bessel potential spaces

时 间：2025年10月22日(星期三)10:00

地 点：理工楼 518

报告摘要：In my talk I will discuss some sufficient and some necessary conditions for the validity of the inequality

$$\|fg\|_{H^s_p(\mathbb{R}^d)}\lesssim\|f\|_{H^{s_1}_{p_1}(\mathbb{R}^d)}\|g\|_{H^{s_2}_{p_2}(\mathbb{R}^d)},$$

$f\in H^{s_1}_{p_1}(\mathbb{R}^d)$, $g\in H^{s_2}_{p_2}(\mathbb{R}^d).$

Afterwards, as an application, we will discuss characterizations of multiplier spaces for pairs $M(H^{s_2}_{p_2}(\mathbb{R}^d), H^s_p(\mathbb{R}^d)).$

欢迎广大师生参加！

Winfried Sickel 教授简介

Professor Winfried Sickel is a faculty member at the University of Jena in Germany. He obtained his Ph.D. in 1984 from the University of Jena under the supervision of the internationally renowned mathematician Professor Hans Triebel. Professor Sickel is an internationally renowned expert in the field of harmonic analysis and function spaces and has achieved a series of significant research results in these fields. He has published over 110 academic papers in internationally renowned mathematical journals such as Journal of the London Mathematical Society, Journal of Functional Analysis, Mathematische Zeitschrift, and Journal of Fourier Analysis and Applications. Currently, Professor Winfried Sickel serves as an editorial board member for the prestigious SCI journals Journal of Fourier Analysis and Applications and Journal of Approximation Theory.

甘肃应用数学中心

甘肃省高校应用数学与复杂系统省级重点实验室

数学与统计学院

萃英学院

2025年10月17日