  A finite-dimensional Lie algebra is called an A-algebra if all of its
nilpotent subalgebras are abelian. These arise in the study of constant
Yang-Mills potentials and have also been particularly important in relation to
the problem of describing residually finite varieties. They have been studied
by several authors, including Bakhturin, Dallmer, Drensky, Sheina, Premet,
Semenov, Towers and Varea. In this paper we establish generalisations of many
of these results to Leibniz algebras.
