76.6 RightDescentSet

RightDescentSet( W, w )

The set of generators s such that l(ws)< l(w), given as a list of integers.

    gap> W := CoxeterGroup( "A", 2 );;
    gap> w := PermCoxeterWord( W, [ 1, 2 ] );;
    gap> RightDescentSet( W, w );
    [ 2 ] 

See also LeftDescentSet.

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

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