报告题目:Evaluation functions and composition operators on Banach spaces of holomorphic functions
报 告 人:曹广福 教授
所在单位:广州大学
报告时间:2023年5月8日 星期一下午 15:00-16:00
报告地点:数学楼第二报告厅
校内联系人:朱森 zhusen@jlu.edu.cn
报告摘要:Let B(Ω) be the Banach space of holomorphic functions on a bounded connected domain Ω in C^n, which contains the ring of polynomials on Ω. In this talk we first establish a criterion for B(Ω) to be reflexive via evaluation functions on B(Ω), that is, B(Ω) is reflexive if and only if the evaluation functions span the dual spaces (B(Ω)). Moreover, under suitable assumptions on Ω and B(Ω), we establish a characterization of the composition operator C_φ to be a Fredholm operator on B(Ω) via the property of the holomorphic self-map φ : Ω → Ω. Our new approach utilizes the symbols of composition operators to construct a linearly independent function sequence, which bypasses the use of boundary behavior of reproducing kernels as those may not be applicable in our general setting.
报告人简介: 曹广福,广州大学二级教授,博士生导师。享受国务院特殊津贴,全国首届高校百名教学名师奖获得者,入选国家“特殊人才支持计划”领军人才教学名师,曾任广州大学数学与信息科学学院经理。长期从事基础数学的研究工作,主持国家自然科学基金面上项目8项,主持教育部高等学校博士点基金3项。在Advances in Mathematics、Journal of Functional Analysis等国际上有重要影响的刊物上公开发表论文120余篇。曾获国家教学成果奖二等奖,连续主持了三届国家级创建名牌课程项目,主持了教育部教学改革项目及省级精品课程建设项目,主编了国家“十五”、“十一五”规划教材,获得过国家优秀教材二等奖、南粤优秀教师、省级优秀教学成果奖及宝钢优秀教师奖等荣誉称号。