Geodesic
Extended centroids of power series rings
Glasgow mathematical journal, Tome 32 (1990) no. 3, pp. 371-375

Voir la notice de l'article provenant de la source Cambridge University Press

Prime rings came into prominence when Posner characterized prime rings satisfying a polynomial identity [9]. The scarcity of invertible central elements made it difficult to generalize results from central simple and primitive algebras to prime rings. For example, we do not automatically have tensor products at our disposal. In [5], the first author introduced the Martindale ring of quotients Q(R) of a prime ring R in his theorem characterizing prime rings satisfying a generalized polynomial identity (GPI). Q(R) is a prime ring containing R whose center C is a field called the extended centroid of R. The central closure of R is the subring RC of Q(R) generated by R and C. RC is a closed prime ring since its extended centroid equals its center C. Hence we have a useful procedure for proving results about an arbitrary prime ring R. We first answer the question for closed prime rings and then apply to R the information obtained from RC. It should be noted that simple rings and free algebras of rank at least 2 are closed prime rings. For these reasons, closed prime rings are natural objects to study. 
Martindale, W. S.; Rosen, M. P. Extended centroids of power series rings. Glasgow mathematical journal, Tome 32 (1990) no. 3, pp. 371-375. doi: 10.1017/S0017089500009459
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