2003/06/30 by Tomasz Brzezinski, Brzezinski, Tomasz, Piotr M. Hajac +1 · 1 citation
Mathematics · #FOS: Mathematics #K-Theory and Homology (math.KT) #Quantum Algebra (math.QA) #math.KT #math.QA
paper · pdf · doi:10.48550/arxiv.math/0306436
4 pages, LaTeX
arxiv created 2003/06/30 · arxiv updated 2009/11/30
Following the idea of Galois-type extensions and entwining structures, we define the notion of a principal extension of noncommutative algebras. We show that modules associated to such extensions via finite-dimensional corepresentations are finitely generated projective, and determine an explicit formula for the Chern character applied to the thus obtained modules.