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New Lie algebras over the group $\mathbb Z_2^3$
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abstract
A new structure, based on joining copies of a group by means of a \emph{twist}, has recently been considered to describe the brackets of the two exceptional real Lie algebras of type $G_2$ in a highly symmetric way. In this work we show that these are not isolated examples, providing a wide range of Lie algebras which are generalized group algebras over the group $\mathbb{Z}_2^3$. On the one hand, some orthogonal Lie algebras are quite naturally generalized group algebras over such group. On the other hand, previous classifications on graded contractions can be applied to this context getting many more examples, involving solvable and nilpotent Lie algebras of dimensions 32, 28, 24, 21, 16 and 14.
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$\mathbb{Z}_2^3$-grading of the Lie algebra $G_2$ and related color algebras
The paper constructs a simple Z2^3-graded basis for G2 and three new Z2^3-graded color algebras of type G2, plus a Z2^2-graded color algebra in a Cartan-Weyl basis.
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