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math.QA2022
A remark on the Hochschild dimension of liberated quantum groups
Tomasz Brzeziński, Ulrich Krähmer, Réamonn Ó Buachalla +1
Let be a Hopf algebra equipped with a projection onto the coordinate Hopf algebra of a semisimple algebraic group . It is shown that if admits a suitabl…
math.QA2022
Pointed Hopf algebra (co)actions on rational functions
Ulrich Krähmer, Blessing Bisola Oni
This article studies the construction of Hopf algebras acting on a given algebra in terms of algebra morphisms . The approach is par…
math.CT2022
Cyclic duality for slice and orbit 2-categories
John Boiquaye, Philipp Joram, Ulrich Krähmer
The self-duality of the paracyclic category is extended to a certain class of homotopy categories of (2,1)-categories. These generalise the orbit category of a group and are associ…