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正特征的高维半单和余半单霍普夫代数

On Finite-Dimensional Semisimple and Cosemisimple Hopf Algebras in Positive Characteristic

Pavel Etingof, Shlomo Gelaki

摘要:

近年来,特征为零的域上有限维半单霍普夫代数的研究取得了重要进展。然而,很少有人知道在积极的特点领域。本文证明了正特征域上有限维半单和余半单霍普夫代数A的一些结果,特别是Kaplansky关于A的对极阶的第5个猜想.这些结果已经在特征为零的域上得到了证明,因此在某种意义上,我们证明了考虑这样的域上的半单霍普夫代数(它们也是余半单的),然后利用我们的提升定理2.1证明它对于正特征域上的半单和余半单霍普夫代数是足够的。在提升定理2.1的证明中,我们使用了从正到零特征的变形理论的标准变元。证明的关键是A的双代数上同调群为零的定理。

英文摘要:

Recently, important progress has been made in the study of finite-dimensional semisimple Hopf algebras over a field of characteristic zero. Yet, very little is known over a field of positive characteristic. In this paper we prove some results on finite-dimensional semisimple and cosemisimple Hopf algebras A over a field of positive characteristic, notably Kaplansky's 5th conjecture on the order of the antipode of A. These results have already been proved over a field of characteristic zero, so in a sense we demonstrate that it is sufficient to consider semisimple Hopf algebras over such a field (they are also cosemisimple), and then to use our Lifting Theorem 2.1 to prove it for semisimple and cosemisimple Hopf algebras over a field of positive characteristic. In our proof of Lifting Theorem 2.1 we use standard arguments of deformation theory from positive to zero characteristic. The key ingredient of the proof is the theorem that the bialgebra cohomology groups of A vanish.

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