报告题目: On The Zero-Sum Subsequences of Modular Restricted Lengths
报告嘉宾:赵凯文 博士 南宁师范大学
报告时间:2024年6月5日 10:00
腾讯会议:708 229 905
报告摘要:Let G be an additive finite abelian group and let l be a positive integer. Denote by discl(G) the smallest positive integer t such that every sequence S over G of length |S|≥t has a nonempty zero-sum subsequence T with length |T|≠l. Let disc(G) denote the smallest positive integer t such that every sequence S over G of length |S|≥t has two nonempty zero-sum subsequences of distinct lengths. Gao et al. proved that disc(G) = max{discl(G) : l∈N0}. In this paper, we continue to investigate this invariant discl(G) by introducing a new invariant Ek,u(G). Let k and u be positive integers with k≥2 and u∈[1, k]. Denote by Ek,u(G) the smallest positive integer t such that every sequence S over G of length |S|≥t has a nonempty zero-sum subsequence T with length |T| is not equal to u modular k. Except for considering the exact value and inverse problem of discl(G), we also study the relationship between Ek,u(G) and disc(G), discl(G) for various types of abelian groups. In particular, we determine the exact value of Ek,u(G) for G = Cn with u∈[1, k] and that of Ek,u(G) for elementary abelian 2-groups, respectively.
报告嘉宾简介:赵凯文,博士,2018年在南开大学组合数学中心获博士学位,之后在华南师范大学从事博士后研究,目前在南宁师范大学数学与统计学院工作。主要研究领域:组合数学中的零和理论。在JNT、FFA、EJC、Discrete Math.等期刊发表多篇学术论文,主持广西自然基金、国家自然基金青年基金等。