%0 Journal Article %T Some Remarks on the Quantum Double %A Shahn Majid %J Physics %D 1994 %I arXiv %R 10.1007/BF01690458 %X We recall the abstract theory of Hopf algebra bicrossproducts and double cross products due to the author. We use it to develop some less-well known results about the quantum double as a twisting, as an extension and as $q$-Lorentz group. %U http://arxiv.org/abs/hep-th/9409056v1