Hassanzadeh, M.; Kucerovsky, D.; Rangipour, B.
(Symmetry, Integrability and Geometry: Methods and Applications, 2014)
A category of coefficients for Hopf cyclic cohomology is defined. It is shown that this category has two proper subcategories of which the smallest one is the known category of stable anti Yetter-Drinfeld modules. The ...