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arXiv math/0005177math.RTmath.AC
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霍普夫代数的Brauer群的同构

Some isomorphisms for the Brauer groups of a Hopf algebra

Giovanna Carnovale

摘要:

利用范畴的等价性,我们给出了不同霍普夫代数的Brauer群之间的同构.作为例子,我们证明了当k是一个特征不等于2的域时,Sweedler霍普夫代数H_4上的每个对偶拟三角结构r_t的Brauer群BC(k,H_4,r_t)都同构于(k,+)的直和以及k的Brauer-Wall群.给出了霍普夫代数H的Brauer群与对偶霍普夫代数H^* 的Brauer群之间的同构,推广了Tilborghs的一个结果.最后,我们将H的Brauer群与它的对立和共对立霍普夫代数的Brauer群联系起来。

英文摘要:

Using equivalences of categories we provide isomorphisms between the Brauer groups of different Hopf algebras. As an example, we show that when k is a field of characteristic different from 2 the Brauer groups BC(k,H_4,r_t) for every dual quasitriangular structure r_t on Sweedler's Hopf algebra H_4 are all isomorphic to the direct sum of (k,+) and the Brauer-Wall group of k. We provide an isomorphism between the Brauer group of a Hopf algebra H and the Brauer group of the dual Hopf algebra H^* generalizing a result of Tilborghs. Finally we relate the Brauer groups of H and of its opposite and co-opposite Hopf algebras.

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