On Biproducts and Extensions
arXiv:2007.10072
Abstract
We describe in which ways the Radford biproducts of certain eight-dimensional Yetter-Drinfel'd Hopf algebras over the elementary abelian group of order 4 can be written as extensions of Hopf algebras.
44 pages. See also https://www.math.mun.ca/~sommerh/