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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