William B. Johnson教授受邀做天元名家讲堂

5月12日上午，应国家天元数学东南中心与数学科学学院邀请，美国德州农工大学William B. Johnson教授通过腾讯会议平台为我院师生做了题为《Some 20+ year old problems in the geometry of Banach spaces》的天元名家讲堂。

国家天元数学东南中心执行委员会主任、厦门大学数学科学学院院长谭绍滨教授出席本次讲座并代表东南中心和数学科学学院致辞。他首先对William B. Johnson教授做客名家讲堂表示了欢迎与感谢，接着介绍了国家天元数学东南中心的基本情况并诚挚邀请William B. Johnson教授疫情后来厦门大学进行学术交流。本次讲座由厦门大学数学科学学院程立新教授主持。

本次讲座中，William B. Johnson教授主要介绍了近二十年Banach空间及其上的算子的重要问题，并着重阐述了逼近性质和算子理想理论遗留的问题，以及本人在这些问题上取得的重大突破，同时指出了一些有待解决的有趣问题。讲座结束后，William B. Johnson教授与参加讲座的师生们展开了热烈的讨论，并耐心地解答了师生们提出的问题。

专家简介：William B. Johnson is a Distinguished Professor and A. G. & M. E. Owen Chair of Mathematics at Texas A&M University. His research lies in the theory of Banach space, a branch of functional analysis. As a world leading expert in the field, he has edited four books including two volumes of Handbook of the Geometry of Banach Spaces, written more than 130 scholarly papers, many of which were published in top journals such as J. Amer. Math. Soc., Acta Math. and Ann. Math. He also served on the editorial board of eight renowned journals including Transactions and Memoirs of the American Mathematical Society (1982-1987), Geometric and Functional Analysis (1990-2001) and Mathematische Annalen (2000-2011).

The influence of Professor Johnson’s work goes beyond the scope of functional analysis.One of his best known result is the celebrated Johnson-Lindenstrauss Lemma, named after him and Joram Lindenstrauss, which has been found to have many applications in different areas such as compress sensing and theoretical computer science. Due to his remarkable achievement in Banach space theory, he winned the prestigious Stefan Banach Medal from the Polish Academy of Sciences in 2007. In 2013, he was named as Inaugural Fellow of the American Mathematical Society. He was also invited to speak at the International Congress of Mathematicians 2018 (ICM 2018) held in São Paulo.