Category Archives: before 2000

Primeness of the enveloping algebra of Hamiltonian superalgebras

Mark C. Wilson, Bulletin of the Australian Mathematical Society 56 (1997), 483-488.

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Abstract: In 1990 Allen Bell presented a sufficient condition for the primeness of the universal enveloping algebra of a Lie superalgebra. Let $latex Q$ be a nonsingular bilinear form on a finite-dimensional vector space over a field of characteristic zero. In this paper we show that Bell’s criterion applies to the Hamiltonian Cartan type superalgebras determined by $latex Q$, and hence obtain some new prime noetherian rings.

Crossed products of restricted enveloping algebras

Mark C. Wilson, Communications in Algebra 25 (1997), 487-496.

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Abstract:

Let $latex K$ be a field of characteristic $latex p>0$, let $latex L$ be a restricted Lie algebra and let $latex R$ be an associative $latex K$-algebra. It is shown that the various constructions in the literature of crossed product of $latex R$ with $latex u(L)$ are equivalent. We calculate explicit formulae relating the parameters involved and obtain a formula which hints at a noncommutative version of the Bell polynomials.


Primeness of the enveloping algebra of a Cartan type Lie superalgebra

Mark C. Wilson, Proceedings of the American Mathematical Society 124 (1996), 383-387.

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Abstract: We show that a primeness criterion for enveloping algebras of Lie superalgebras discovered by Bell is applicable to the Cartan type Lie superalgebras $latex W(n)$, $latex n$ even. Other algebras are considered but there are no definitive answers in these cases.

Delta methods for enveloping algebras of Lie colour algebras

Mark C. Wilson, Journal of Algebra 175 (1995), 661-696.

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Abstract: In recent papers J. Bergen and D.S. Passman have applied so-called `Delta methods’ to enveloping algebras of Lie superalgebras. This paper generalizes their results to the class of Lie colour algebras. The methods and results in this paper are very similar to those of Bergen and Passman, and many of their proofs generalize easily. However, at some points there are serious difficulties to overcome. The results obtained show that if $latex L$ is a Lie colour algebra then the join of all finite-dimensional ideals of $latex L$ controls certain properties of the universal enveloping algebras $latex U(L)$. Specifically, we consider primeness, semiprimeness, constants, semi-invariants, almost constants, faithfulness of the adjoint action, the centre, almost centralizers and the central closure.