报告人：伍晓磊（复旦大学）
时间：2026年4月9日10:00-11:00
地点：物质科研楼C1124
I will begin by introducing the basic notions of finiteness properties of groups, including finite generation, finite presentability, and their topological and algebraic generalizations. I will then describe the Bestvina–Brady construction, which produces groups with strikingly exotic properties, in particular groups of type FP_2 that are not finitely presented. Finally, I will explain how to construct simple groups exhibiting these exotic finiteness properties. The construction uses Rover–Nekrashevych groups. This is based on joint work with Claudio Llosa Isenrich and Eduard Schesler.
