Finite Weyl groupoids

Details Finite Weyl groupoids Finite Weyl groupoids

2010-08-31

arxiv.org/abs/1008.5291v1

Mathematics

Combinatorics

35 pages, 4 figures

Scientific paper

Using previous results concerning the rank two and rank three cases, all connected simply connected Cartan schemes for which the real roots form a finite irreducible root system of arbitrary rank are determined. As a consequence one obtains the list of all crystallographic arrangements, a large subclass of the class of simplicial hyperplane arrangements. Supposing that the rank is at least three, the classification yields Cartan schemes of type $A$ and $B$, an infinite family of series involving the types $C$ and $D$, and $74$ sporadic examples.

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