The Order Dimension of the Poset of Regions in a Hyperplane Arrangement

Details The Order Dimension of the Poset of Regions in a Hyperplane Arrangement The Order Dimension of the Poset of Regions in a Hyperplane Arrangement

2003-05-23

arxiv.org/abs/math/0305336v2

Mathematics

Combinatorics

Minor changes, including a correction and an added figure in the proof of Proposition 2.2. 19 pages, 6 figures

Scientific paper

We show that the order dimension of the weak order on a Coxeter group of type A, B or D is equal to the rank of the Coxeter group, and give bounds on the order dimensions for the other finite types. This result arises from a unified approach which, in particular, leads to a simpler treatment of the previously known cases, types A and B. The result for weak orders follows from an upper bound on the dimension of the poset of regions of an arbitrary hyperplane arrangement. In some cases, including the weak orders, the upper bound is the chromatic number of a certain graph. For the weak orders, this graph has the positive roots as its vertex set, and the edges are related to the pairwise inner products of the roots.

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