arxiv: Mathematics::K-Theory and Homology | Mathematics::Quantum Algebra | Mathematics::Category Theory
mesheuropmc: genetic structures | sense organs
We use stable anti Yetter-Drinfeld contramodules to improve the cup products in Hopf cyclic cohomology. The improvement fixes the lack of functoriality of the cup products previously defined and show that the cup products are sensitive to the coefficients.
 Brzezin´ski, T., Hopf-cyclic homology with contramodule coefficients. To appear in Quantum Groups and Noncommutative Spaces, M Marcolli and D Parashar (eds) Vieweg Verlag (MaxPlanck Series), Preprint 2008, arXiv:0806.0389.
 Brzezin´ski, T., Flat connections and (co)modules, New Techniques in Hopf Algebras and Graded Ring Theory, Universa Press, Wetteren, 2007 pp. 35-52. arxiv:math.QA/0608170.