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A classification of the simple weight modules is given for the (6-dimensional) Euclidean Lie algebra (3) = 2⋉V3. As an intermediate step, a classification of all simple modules is given for the centralizer C of the Cartan element H (in the universal enveloping algebra  = U((3))). Generators and defining relations for the algebra C are found (there are three quadratic relations and one cubic relation). The algebra C is a Noetherian domain of Gelfand-Kirillov dimension 5. Classifications of prime, primitive, completely prime, and maximal ideals are given for the algebra U .

Prime ideals of the enveloping algebra of the Euclidean algebra and a classification of its simple weight modules