Nichols algebras over groups with finite root system of rank two II
Nichols algebras over groups with finite root system of rank two II
Abstract We classify all non-abelian groups G for which there exists a pair ( V , W ) of absolutely simple Yetter–Drinfeld modules over G such that the Nichols algebra of the direct sum of V and W is finite-dimensional, under two assumptions: the square of the braiding between V …