讲座题目:On set-valued means
报告人:Kazimierz Nikodem 教授(University of Bielsko-Biała)
讲座时间:2024年9月9日(星期一)15:30-16:30
讲座地点:犀浦校区3号教学楼X30456
报告人简介:Kazimierz Nikodem 教授于1977年获得Silesian大学数学硕士学位;1981年获得Silesian大学数学博士学位;2001年被评为正教授。现任Bielsko-Biała大学数学系主任,曾任Bielsko-Biała大学副校长。目前已在 Proc. Amer. Math. Soc., Nonlinear Anal., J. Convex Anal., Ann. Polon. Math.等数学期刊上发表110余篇文章,参加超过90场国内外国际讨论会会议,主要研究领域有凸分析、泛函方程和不等式、集值函数。
讲座内容简介:Let X be a real vector space and D be a convex nonempty subset of X. Denote by S(D) the family of all nonempty subsets of D. We say that a function M : Dn→S(D) is a set-valued mean if M (x1, . . . , xn ) ⊂ conv{x1, . . . , xn } for all x1 , . . . , xn in D. The set-valued means Mt : Dn → S(D) defined by
Mt (x1, . . . , xn ) = tconv{x1, . . . , xn } + (1 − t) x,
where t ∈ [0, 1] and x =(x1 +· · ·+xn ), are investigated and various properties of them are presented. Set-valued counterparts of the quasi-arithmetic and Lagrangian means are considered.
主办:研究生院
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