Gluing representations via idempotent modules and constructing endotrivial modules. (English summary) J. Pure Appl. Algebra 213 (2009), no. 2, 173–193. Endotrivial modules have been constructed in several ways, either in an elementary and direct manner or by the use of sophisticated representation theory. The authors give a new and fascinating approach of the latter sort, using infinite-dimensional Rickard idempotent modules, and construct thereby a subgroup of finite index in the group of all endotrivial modules. A general gluing method is used and studied
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