The structure of corings with a grouplike element
Volume 61 / 2003
Banach Center Publications 61 (2003), 21-35
MSC: 16W30, 13B02.
DOI: 10.4064/bc61-0-2
Abstract
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.
