Daniel Bulacu

We characterize double byproducts as ordinary byproducts, and show that their deformations by 2-cocycles are double wreath quasi-quantum groups. 

Also, we present examples of 2-cocycles from almost skew pairings in categories of Yetter-Drinfeld modules and show that various types of quasi-quantum groups known in the literature are of this type (joint work with Daniel Popescu and Blas Torrecillas).