longestWeylGroupElement -- the longest element of a Weyl group

Ways to use longestWeylGroupElement:

• longestWeylGroupElement(RootSystem) -- the longest element of the Weyl group of a root system
• longestWeylGroupElement(RootSystem,Parabolic) -- the longest element of a parabolic subgroup of the Weyl group of a root system

For the programmer

The object longestWeylGroupElement is a method function.