GAP Manual: 63.21. WeylMueMat

WeylMueMat( W, list )

returns the list of highest coefficients mu_(y,w) of the Kazhdan- Lusztig polynomials corresponding to pairs of elements of the Weyl group W from a list list. The elements in list must be reduced expressions in the standard generators, ordered by increasing length. E.g., list is the result of Iterated(WeylElements(W),Concatenation). (See the next section for an example.)

This function requires the package "weyl" (see RequirePackage).