THE RELATIVE PICARD GROUP OF A COMODULE ALGEBRA AND HARRISON COHOMOLOGY

Proceedings of the Edinburgh Mathematical Society

S. Caenepeel¹ 

[1] T. Guédénon

关键词: Primary 16W30;    Picard group;    coring;    Harrison cohomology;   

DOI  :  10.1017/S0013091504000549

学科分类：数学（综合）

来源: Cambridge University Press

【 摘 要 】

Let $A$ be a commutative comodule algebra over a commutative bialgebra $H$. The group of invertible relative Hopf modules maps to the Picard group of $A$, and the kernel is described as a quotient group of the group of invertible group-like elements of the coring $Aotimes H$, or as a Harrison cohomology group. Our methods are based on elementary $K$-theory. The Hilbert 90 theorem follows as a corollary. The part of the Picard group of the coinvariants that becomes trivial after base extension embeds in the Harrison cohomology group, and the image is contained in a well-defined subgroup $E$. It equals $E$ if $H$ is a cosemisimple Hopf algebra over a field.

【 授权许可】

Unknown