A labeled graph whose nodes are indexed by the generators of a Coxeter Group having as an Edge labeled by whenever , where is an element of the Coxeter Matrix. Coxeter-Dynkin diagrams are used to visualize Coxeter Groups. A Coxeter-Dynkin diagram is associated with each Rational Double Point (Fischer 1986).

**References**

Arnold, V. I. ``Critical Points of Smooth Functions.'' *Proc. Int. Congr. Math.* **1**, 19-39, 1974.

Fischer, G. (Ed.). *Mathematical Models from the Collections of Universities and Museums.*
Braunschweig, Germany: Vieweg, pp. 12-13, 1986.

© 1996-9

1999-05-25