A Coxeter–Dynkin diagram is a graphical representation used to describe finite and infinite reflection groups, which are important in various areas of mathematics, including geometry, algebra, and theoretical physics. These diagrams are named after mathematicians Harold Scott MacDonald Coxeter and Jacques Dynkin. ### Key Features of Coxeter–Dynkin Diagrams: 1. **Vertices**: Each vertex of the diagram represents a simple root of a root system associated with a given reflection group.
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