Speaker: Zhiyun Cheng (Beijing Normal University, and GWU)
Title: When is region crossing change an unknotting operation?
Abstract: In recent years, more and more android/ios puzzle games are designed based on mathematics. For example, Region Select, a puzzle game which was developed by Akio Kawauchi, Ayaka Shimizu and Kengo Kishimoto, is based on the study of a local operation (region crossing change) on link diagrams. In this talk I will discuss the mathematical background behind this game.
