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On lie algebras with monomial basis
A. I. Sozutov
Abstract:
A basis
$D$ of an algebra
$L$ over a field
$\Phi$ is called monomial if
$ab=\alpha_{ab}c$ for all
$a,b,c\in D$ and
$\alpha_{ab}\in\Phi$. Such a basis is said to be
homogeneous if
$\alpha_{ab}\in\{-1,0,1\}$. A subalgebra
$S$ in
$L$ generated by elements of
$D$ is called a
$D$-
subalgebra and the minimal number of generators for
$S$ that belong to
$D$ is called,the rank of
$S$. We study Lie algebras with a monomial basis
$D$ such that every pair of its elements generates a subalgebra in
$L$ which is abelian or 3-dimensional simple.
All connected algebras of rank 3 are listed: they are an algebra of type
$D_2$ over an arbitrary field, a 7-dimensional simple algebra of characteristic 3, and two families of 7-dimensional simple algebras of characteristic 2 (Theorem 2.1).
In the case when
$L$ includes no 7-dimensional simple
$D$-subalgebras, we prove that
$D$ is embeddable as a set of 3-transpositions into some group
$G$ and, moreover, the multiplication in
$L$ is determined by the group multiplication to within structure constants. This, in particular, shows that the algebra
$L$ is locally finite.
In the case when
$G$ is a symmetric group
$\Sigma_{\Omega}$, simple formulas for the multiplication in
$L$ are found. Furthermore, if
$|\Omega|=m<\infty$ then
$L$ is an algebra of type
$D_n$ for
$m=2n$, and a classical algebra of type
$B_n$ for
$m=2n+1$.
UDC:
512.42/81:519.44/45
Received: 11.03.1992
Revised: 10.02.1993