On I-null Lie algebras
Abstract
We consider the class of Lie algebras for which the Koszul 3-form is zero, and prove that it contains all quotients of Borel subalgebras, or of their nilradicals, of finite dimensional semi-simple Lie algebras. A list of Kac-Moody types for indecomposable nilpotent Lie algebras of dimension at most 7 is given.
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