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TitleComputing with real Lie algebras: Real forms, Cartan decompositions, and Cartan subalgebras
Author(s) Willem A., Heiko Dietrich, Paolo Faccin
TypeArticle in Journal
AbstractAbstract We describe algorithms for performing various tasks related to real simple Lie algebras. These algorithms form the basis of our software package CoReLG, written in the language of the computer algebra system GAP4. First, we describe how to efficiently construct real simple Lie algebras up to isomorphism. Second, we consider a real semisimple Lie algebra g . We provide an algorithm for constructing a maximally (non-)compact Cartan subalgebra of g ; this is based on the theory of Cayley transforms. We also describe the construction of a Cartan decomposition g = k ⊕ p . Using these results, we provide an algorithm to construct all Cartan subalgebras of g up to conjugacy; this is a constructive version of a classification theorem due to Sugiura.
KeywordsReal simple Lie algebras, Cartan decompositions, Cartan subalgebras
URL http://www.sciencedirect.com/science/article/pii/S0747717113000709
JournalJournal of Symbolic Computation
Pages27 - 45
Translation No
Refereed No