$π_1$-classification of real arrangements with up to eight lines

Details $π_1$-classification of real arrangements with up to eight lines $π_1$-classification of real arrangements with up to eight lines

2001-07-26

arxiv.org/abs/math/0107192v1

Topology 42(1), 265--289 (2003)

Mathematics

Algebraic Geometry

29 pages, many figures; Submitted

Scientific paper

One of the open questions in the geometry of line arrangements is to what extent does the incidence lattice of an arrangement determine its fundamental group. Line arrangements of up to 6 lines were recently classified by K.M. Fan, and it turns out that the incidence lattice of such arrangements determines the projective fundamental group. We use actions on the set of wiring diagrams, introduced in [GTV] (math.AG/0107178), to classify real arrangements of up to 8 lines. In particular, we show that the incidence lattice of such arrangements determines both the affine and the projective fundamental groups.

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