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Nichols algebras are graded braided Hopf algebras satisfying a universal property. Many structural results of a Nichols algebra can be obtained by studying itsWeyl groupoid and its homology. In the mini-workshop, introductions to and recent developments on these structures were presented and open problems were discussed.
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Nicolás Andruskiewitsch, Michael Cuntz, István Heckenberger, Sarah Witherspoon, Mini-Workshop: Nichols Algebras and Weyl Groupoids. Oberwolfach Rep. 9 (2012), no. 4, pp. 2879–2905