76.18 PermMatX

PermMatX( W, M )

Let M be a linear transformation of the vector space V on which the Coxeter datum W acts which preserves the set of roots. PermMatX returns the corresponding permutation of the roots; it signals an error if M does not normalize the set of roots.

We continue the example from MatXPerm and obtain:

    gap> PermMatX( W, mx ) = w0;
    true 

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

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