Automorphisms of Generalized Down-Up Algebras

Carvalho, Paula A. A. B.; Lopes, Samuel A.

Automorphisms of Generalized Down-Up Algebras

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Description

A generalization of down-up algebras was introduced by Cassidy and Shelton (J. Algebra 279 (2004), no. 1), the so-called generalized down-up algebras. We describe the automorphism group of conformal Noetherian generalized down-up algebras L(f,r,s,γ) such that r is not a root of unity, listing explicitly the elements of the group. In the last section we apply these results to Noetherian down-up algebras, thus obtaining a characterization of the automorphism group of Noetherian down-up algebras A(α, β, γ) for which the roots of the polynomial X^2-αX-βare not both roots of unity.
20 pages