LieAlgebra.DerivedSeries
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LieAlgebra.DerivedSeries(k)

Parameters:
Returns:
Notes:
This algorithm calculates the k-th lower central series D(k) of the Liealgebra.  Let g denote the Lie-Algebra. Then the k-th lower central series is given via the recursive definition: D(k=1) g = g, D(k= i+1)g = [D(i)g, L(i)g]