A generalization of Coxeter groups, root systems, and Matsumoto's theorem

Details A generalization of Coxeter groups, root systems, and Matsumoto's theorem A generalization of Coxeter groups, root systems, and Matsumoto's theorem

2006-10-27

arxiv.org/abs/math/0610823v1

Mathematics

Quantum Algebra

16 pages

Scientific paper

The root systems appearing in the theory of Lie superalgebras and Nichols algebras admit a large symmetry extending properly the one coming from the Weyl group. Based on this observation we set up a general framework in which the symmetry object is a groupoid. We prove that in our context the groupoid is generated by reflections and Coxeter relations. This answers a question of Serganova. Our weak version of the exchange condition allows us to prove Matsumoto's theorem. Therefore the word problem is solved for the groupoid.

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