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Growth of generalized Weyl algebras over polynomial algebras and Laurent polynomial algebras

Xiangui Zhao  
【摘要】:We study the growth and Gelfand-Kirillov dimension(GK-dimension) of the generalized Weyl algebra(GWA) A = D(σ, a), where D is a polynomial algebra or a Laurent polynomial algebra. Several necessary and sufficient conditions for GKdim(A) = GKdim(D) + 1 are given. In particular, we prove a dichotomy of the GK-dimension of GWAs over the polynomial algebra in two indeterminates, namely, GKdim(A) is either 3 or∞ in this case. Our results generalize several existing results in the literature and can be applied to determine the growth, GK-dimension, simplicity and cancellation properties of some GWAs.

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