Media type: E-Article Title: The Weyl groupoid of a Nichols algebra of diagonal type Contributor: Heckenberger, I. imprint: Springer Science and Business Media LLC, 2006 Published in: Inventiones mathematicae Language: English DOI: 10.1007/s00222-005-0474-8 ISSN: 0020-9910; 1432-1297 Origination: Footnote: