报告题目:Finite groups whose nonnormal subgroups have few orders 报告人:吕恒(西南大学 教授) 报告时间:2026年1月4日(星期日) 上午09:00-10:00 地点:明理楼401 报告摘要:Suppose that G is a finite solvable group. Let t = nc(G) denote the number of orders of nonnormal subgroups of G. We bound the derived length dl(G) in terms of nc(G). If G is a finite p-group, we show that the order of G is also bounded by t. 报告人简介: 吕恒,男,西南大学数学与统计学院,教授,博士生导师。2008年博士毕业于陕西师范大学。主要研究方向是有限群论及其表示,相关方向发表论文30余篇,主要成果发表在Journal of algebra、Journal of pure and applied algebra、Journal of group theory等国际知名期刊上。主持面上项目3项。