rootSystem -- obtain a root system

Ways to use rootSystem:

• rootSystem(DynkinDiagram) -- the root system corresponding to a Dynkin diagram
• rootSystem(DynkinType) -- the root system of a given type
• rootSystem(RootSystem,Parabolic) -- the root system of the Levy subgroup of a parabolic

For the programmer

The object rootSystem is a method function.

The source of this document is in WeylGroups.m2:1779:0.