Higher homotopy groups of complements of complex hyperplane arrangements

Details Higher homotopy groups of complements of complex hyperplane arrangements Higher homotopy groups of complements of complex hyperplane arrangements

2000-02-29

arxiv.org/abs/math/0002251v4

Advances in Math. 165 (2002), 71-100

Mathematics

Algebraic Topology

24 pages, 3 figures

Scientific paper

10.1006/aima.2001.2023

We generalize results of Hattori on the topology of complements of hyperplane arrangements, from the class of generic arrangements, to the much broader class of hypersolvable arrangements. We show that the higher homotopy groups of the complement vanish in a certain combinatorially determined range, and we give an explicit Z\pi_1-module presentation of \pi_p, the first non-vanishing higher homotopy group. We also give a combinatorial formula for the \pi_1-coinvariants of \pi_p. For affine line arrangements whose cones are hypersolvable, we provide a minimal resolution of \pi_2, and study some of the properties of this module. For graphic arrangements associated to graphs with no 3-cycles, we obtain information on \pi_2, directly from the graph. The \pi_1-coinvariants of \pi_2 may distinguish the homotopy 2-types of arrangement complements with the same \pi_1, and the same Betti numbers in low degrees.

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