Mathematics – Combinatorics
Scientific paper
2010-05-30
Mathematics
Combinatorics
17 pages, 6 figures
Scientific paper
We study the rank 4 linear matroid $M(H_4)$ associated with the 4-dimensional root system $H_4$. This root system coincides with the vertices of the 600-cell, a 4-dimensional regular solid. We determine the automorphism group of this matroid, showing half of the 14,400 automorphisms are geometric and half are not. We prove this group is transitive on the flats of the matroid, and also prove this group action is primitive. We use the incidence properties of the flats and the {\it orthoframes} of the matroid as a tool to understand these automorphisms, and interpret the flats geometrically.
Bao Chencong
Freidman-Gerlicz Camila
Gordon Gary
McGrath Peter
Vega Jessica
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