
arXiv: 0904.3010
A finite-dimensional Lie algebra $L$ over a field $F$ of characteristic zero is called elementary if each of its subalgebras has trivial Frattini ideal; it is an $A$-algebra if every nilpotent subalgebra is abelian. This paper is a continuation of the study of these algebras initiated by the authors in `Elementary Lie Algebras and Lie A-algebras', J. Algebra 312 (2007), 891--901. If we denote by $\mathcal{A}$, $\mathcal{G}$, $\mathcal{E}$, $\mathcal{L}$, $Φ$ the classes of $A$-algebras, almost algebraic algebras, $E$-algebras, elementary algebras and $ϕ$-free algebras respectively, then it is shown that: \mathcal{L} \subset Φ\subset \mathcal{G}, \mathcal{L} \subset \mathcal{A} \subset \mathcal{E} and \mathcal{G} \cap \mathcal{A} = \mathcal{L}. It is also shown that if $L$ is a semisimple Lie algebra all of whose minimal parabolic subalgebras are $ϕ$-free then $L$ is an $A$-algebra, and hence elementary. This requires a number of quite delicate properties of parabolic subalgebras. Finally characterisations are given of $E$-algebras and of Lie algebras all of whose proper subalgebras are elementary.
Rings and Algebras (math.RA), 17B05, 17B20, 17B30, 17B50 (Primary), FOS: Mathematics, Mathematics - Rings and Algebras, Representation Theory (math.RT), 20D10, 20D15, 20D25 (Secondary), Mathematics - Representation Theory, 17B05, 17B20, 17B30, 17B50 (Primary); 20D10, 20D15, 20D25 (Secondary), 510
Rings and Algebras (math.RA), 17B05, 17B20, 17B30, 17B50 (Primary), FOS: Mathematics, Mathematics - Rings and Algebras, Representation Theory (math.RT), 20D10, 20D15, 20D25 (Secondary), Mathematics - Representation Theory, 17B05, 17B20, 17B30, 17B50 (Primary); 20D10, 20D15, 20D25 (Secondary), 510
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