Hi Francesco,

I'm sorry for my long latency time. 

Concerning a Lie algebra defined by the structure constants: keep in mind 
> this is a way often used in Physics, which is not very rigorous. Structure 
> constants define an equivalence class of bases in a Lie algebra.
>
> For example, consider a Lie algebra with two generators: *A, B*. If you 
> define *X = 2*A - 3*B, Y = A + B*, then *X *and *Y* are still generators, 
> but will have generally different structure constants.
>
 
Yes, that is clear to me. Maybe the documentation is too imprecise at this 
point. Unfortunately a "real" Lie-Algebra class makes (except in the 
semisimple case) no sense, because the classification of Lie-Algebras is 
really a non-trivial problem. You may have a look on the method

 GLV_Action(self, a): #Computes the Action of an Element of GL(V) on the 
Variety of Structure Constants

Due to your other remarks, I will revise my code promptly. 

Thank you very much,

Greetings,

Daniel

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