Coxeter and crystallographic arrangements are inductively free

Details Coxeter and crystallographic arrangements are inductively free Coxeter and crystallographic arrangements are inductively free

2010-11-18

arxiv.org/abs/1011.4228v1

Mathematics

Combinatorics

22 pages

Scientific paper

Using the classification of finite Weyl groupoids we prove that crystallographic arrangements, a large subclass of the class of simplicial arrangements which was recently defined, are hereditarily inductively free. In particular, all crystallographic reflection arrangements are hereditarily inductively free, among them the arrangement of type $E_8$. With little extra work we prove that also all Coxeter arrangements are inductively free.

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