Combinatorial representations of Coxeter groups over a field of two elements

Details Combinatorial representations of Coxeter groups over a field of two elements Combinatorial representations of Coxeter groups over a field of two elements

2008-04-14

arxiv.org/abs/0804.2150v2

Mathematics

Representation Theory

20 pages, 2 figures, 2 tables

Scientific paper

Let $W$ denote a simply-laced Coxeter group with $n$ generators. We construct an $n$-dimensional representation $\phi$ of $W$ over the finite field $F_2$ of two elements. The action of $\phi(W)$ on $F_2^n$ by left multiplication is corresponding to a combinatorial structure extracted and generalized from Vogan diagrams. In each case W of types A, D and E, we determine the orbits of $F_2^n$ under the action of $\phi(W)$, and find that the kernel of $\phi$ is the center $Z(W)$ of $W.$

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