题目🧑‍🎨：The Reduced Expressions in a Coxeter System with a Strictly Complete Coxeter Graph

报告人：时俭益 教授（华东师范大学）

地点：致远楼108室

时间👏：2021年11月4日（星期四）下午4：00--5：00

摘要：Let $(W,S)$ be a Coxeter system with a strictly complete Coxeter graph. The present talk is concerned with the set $\Red(z)$ of all reduced expressions for any $z\in W$. By associating each bc-expression to a certain symbol, we describe the set $\Red(z)$ and compute its cardinal $|\Red(z)|$ in terms of symbols. An explicit formula for $|\Red(z)|$ is deduced, where the Fibonacci numbers play a crucial role.

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