On the Notion of a Ribbon Quasi-Hopf Algebra
arXiv:0910.1638
Abstract
We show that two competing definitions of a ribbon quasi-Hopf algebra are actually equivalent. Along the way, we look at the Drinfel'd element from a new perspective and use this viewpoint to derive its fundamental properties.
18 pages. See also http://www.southalabama.edu/mathstat/personal_pages/sommerh/