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arXiv 0904.1883math.RAmath.RT
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关于Sweedler霍普夫代数的全Brauer群的子群结构

On the subgroup structure of the full Brauer group of Sweedler Hopf algebra

Giovanna Carnovale, Juan Cuadra

摘要:

本文引入了一族表示域k上Sweedler霍普夫代数H_4的Brauer群BQ(k,H_4)中元素的三参数二维代数.它们使我们能够描述从拟三角或余拟三角结构中产生的子群的相互交叉。我们还引入了BQ(k,H_4)的一个新子群,其元素由两个自然Z_2-分次重合的代数表示。我们构造了一个关于拟三角结构的8维霍普夫代数E(2)的Brauer群与这个子群的正合序列,该拟三角结构附着在2 × 2-矩阵N上,(1,2)-项为1,其它地方为0.

英文摘要:

We introduce a family of three parameters 2-dimensional algebras representing elements in the Brauer group BQ(k,H_4) of Sweedler Hopf algebra H_4 over a field k. They allow us to describe the mutual intersection of the subgroups arising from a quasitriangular or coquasitriangular structure. We also introduce a new subgroup of BQ(k,H_4) whose elements are represented by algebras for which the two natural Z_2-gradings coincide. We construct an exact sequence relating this subgroup to the Brauer group of Nichols 8-dimensional Hopf algebra E(2) with respect to the quasitriangular structure attached to the 2x2-matrix N with 1 in the (1,2)-entry and zero elsewhere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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