Double Ore Extensions versus Iterated Ore Extensions

Details Double Ore Extensions versus Iterated Ore Extensions Double Ore Extensions versus Iterated Ore Extensions

2009-09-17

arxiv.org/abs/0909.3238v1

Mathematics

Rings and Algebras

Scientific paper

Motivated by the construction of new examples of Artin-Schelter regular algebras of global dimension four, J.J. Zhang and J. Zhang (2008) introduced an algebra extension $A_P[y_1,y_2;\sigma,\delta,\tau]$ of $A$, which they called a double Ore extension. This construction seems to be similar to that of a two-step iterated Ore extension over $A$. The aim of this paper is to describe those double Ore extensions which can be presented as iterated Ore extensions of the form $A[y_1;\sigma_1, \delta_1][y_2;\sigma_2, \delta_2]$. We also give partial answers to some questions posed in Zhang and Zhang (2008).

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