Geodesic
A Relation between the Weyl Group W(e8) and Eight-Line Arrangements on a Real Projective Plane
Serdica Journal of Computing, Tome 1 (2007) no. 4, pp. 403-424 Cet article a éte moissonné depuis la source Bulgarian Digital Mathematics Library

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The Weyl group W(E8) acts on the con guration space of systems of labelled eight lines on a real projective plane. With a system of eight lines with a certain condition, a diagram consisting of ten roots of the root system of type E8 is associated. We have already shown the existence of a W(E8)-equivariant map of the totality of such diagrams to the set of systems of labelled eight lines. The purpose of this paper is to report that the map is injective.
Keywords: Weyl Group, Root System Of Type E8, Real Projective Plane, Simple Eight-line Arrangement, Classification Of Arrangement 
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Fukui, Tetsuo; Sekiguchi, Jiro. A Relation between the Weyl Group W(e8) and Eight-Line Arrangements on a Real Projective Plane. Serdica Journal of Computing, Tome 1 (2007) no. 4, pp. 403-424. http://geodesic.mathdoc.fr/item/SJC_2007_1_4_a2/