Published online by Cambridge University Press:ย 29 July 2019
Let ๐ be the Borel subalgebra of the Lie algebra ๐ฐ๐ฉ2 and V2 be the simple two-dimensional ๐ฐ๐ฉ2-module. For the universal enveloping algebra $\[{\cal A}: = U(\gb \ltimes {V_2})\]$ of the semi-direct product ๐โV2 of Lie algebras, the prime, primitive and maximal spectra are classified. Please approve edit to the sentence โThe sets of completely primeโฆโ.The sets of completely prime ideals of $\[{\cal A}\]$ are described. The simple unfaithful $\[{\cal A}\]$-modules are classified and an explicit description of all prime factor algebras of $\[{\cal A}\]$ is given. The following classes of simple U(๐โV2)-modules are classified: the Whittaker modules, the ๐[X]-torsion modules and the ๐[E]-torsion modules.