Expansions of algebras and superalgebras and some applications 1


After reviewing the three well-known methods to obtain Lie algebras and su-peralgebras from given ones, namely, contractions, deformations and extensions, we describe a fourth method recently introduced, the expansion of Lie (super)algebras. Expanded (super)algebras have, in general, larger dimensions than the original algebra , but also include the ˙ Inön… (More)


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