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- To use DirectSumQ, you first need to load the SYM Package using Needs["SYM`"].

- The Lie algebra
*L*and its subalgebras can be provided either from their structure constants or their infinitesimal generator representation. When providing the Lie algebra*L*with its structure constants denote the elements of the subspaces by using the symbol X, e.g. {X[1], X[4]}.