roots. λ is a lowest weight, and eλ the corresponding element of the group ring of the weight lattice. Ch(F(wλ)) is the character of the Demazure module F(wλ). P is the weight lattice, and Z[P] is its group ring. is the sum of fundamental weights and the dot action is defined by . Δα for α a root is the endomorphism of the Z-module Z[P] defined by and Δj is Δα for α the root of sj References Representation theory