Alexander Invariants of Complex Hyperplane Arrangements

Details Alexander Invariants of Complex Hyperplane Arrangements Alexander Invariants of Complex Hyperplane Arrangements

1997-03-22

arxiv.org/abs/alg-geom/9703030v1

Trans. Amer. Math. Soc. 351 (1999), no. 10, 4043-4067

Mathematics

Algebraic Geometry

26 pages; LaTeX2e with amscd, amssymb packages

Scientific paper

10.1090/S0002-9947-99-02206-0

Let A be an arrangement of complex hyperplanes. The fundamental group of the complement of A is determined by a braid monodromy homomorphism from a finitely generated free group to the pure braid group. Using the Gassner representation of the pure braid group, we find an explicit presentation for the Alexander invariant of A. From this presentation, we obtain combinatorial lower bounds for the ranks of the Chen groups of A. We also provide a combinatorial criterion for when these lower bounds are attained.

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