The structure of corings with a grouplike element

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Characteristic properties of corings with a grouplike element are analysed. Associated differential graded rings are studied. A correspondence between categories of comodules and flat connections is established. A generalisation of the Cuntz-Quillen theorem relating existence of connections in a module to projectivity of this module is proven.
14 pages, LaTeX, uses diagrams.tex Version to appear in Banach Center Publications

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Rings and Algebras, Commutative Algebra, 16W30;13B02

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http://salesiana.dossiersoluciones.com/handle/123456789/62034

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0108117
 http://arxiv.org/abs/math/0108117

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arXiv