WEYL GROUPS OF THE SIMPLY-lACED 4-EXTENDED AFFINE ROOT SYSTEMS

Tadayoshi Takebayashi (Japan)

Received March 13, 2008, March 20, 2008

Abstract

We describe the Weyl groups associated to the simly-laced 4-extended affine root systems [1, 4] in terms of the 4-extended affine diagrams.

Keywords and phrases: 4-extended affine root system, Weyl group.