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Some branching formulas for Kac--Moody Lie algebras
Kyu-Hwan Lee, Jerzy Weyman
In this paper we give some branching rules for the fundamental representations of Kac--Moody Lie algebras associated to -shaped graphs. These formulas are useful to describe gen…
math.RT2018
Rigid reflections and Kac--Moody algebras
Kyu-Hwan Lee, Kyungyong Lee
Given any Coxeter group, we define rigid reflections and rigid roots using non-self-intersecting curves on a Riemann surface with labeled curves. When the Coxeter group arises from…