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Lie algebras of triangular polynomial derivations and an isomorphism criterion for their Lie factor algebras
Izvestiya. Mathematics , Tome 77 (2013) no. 6, pp. 1067-1104.

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We make a detailed study of the Lie algebras $\mathfrak{u}_n$, $n\geqslant 2$, of triangular polynomial derivations, their injective limit $\mathfrak{u}_\infty$, and their completion $\widehat{\mathfrak{u}}_\infty$. We classify the ideals of $\mathfrak{u}_n$ (all of which are characteristic ideals) and use this classification to give an explicit criterion for Lie factor algebras of $\mathfrak{u}_n$ and $\mathfrak{u}_m$ to be isomorphic. We introduce two new dimensions for (Lie) algebras and their modules: the central dimension $\operatorname{c.dim}$ and the uniserial dimension $\operatorname{u.dim}$, and show that $\operatorname{c.dim}(\mathfrak{u}_n)=\operatorname{u.dim}(\mathfrak{u}_n) =\omega^{n-1}+\omega^{n-2}+\dots+\omega +1$ for all $n\geqslant 2$, where $\omega$ is the first infinite ordinal. Similar results are proved for the Lie algebras $\mathfrak{u}_\infty$ and $\widehat{\mathfrak{u}}_\infty$. In particular, $\operatorname{u.dim}(\mathfrak{u}_\infty)=\omega^\omega$ and $\operatorname{c.dim}(\mathfrak{u}_\infty)=0$.
Keywords: Lie algebra, triangular polynomial derivations, automorphism, isomorphism problem, the derived series and lower central series, locally nilpotent derivations, locally nilpotent and locally finite-dimensional Lie algebras. 
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V. V. Bavula. Lie algebras of triangular polynomial derivations and an isomorphism criterion for their Lie factor algebras. Izvestiya. Mathematics , Tome 77 (2013) no. 6, pp. 1067-1104. http://geodesic.mathdoc.fr/item/IM2_2013_77_6_a0/

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