Higher-order Alexander invariants of plane algebraic curves

Details Higher-order Alexander invariants of plane algebraic curves Higher-order Alexander invariants of plane algebraic curves

2005-09-21

arxiv.org/abs/math/0509462v2

Int. Math. Res. Not., Volume 2006 (2006), Article ID 12976, 23 pages

Mathematics

Algebraic Topology

a new section 'Examples' is added

Scientific paper

We define new higher-order Alexander modules $\mathcal{A}_n(C)$ and higher-order degrees $\delta_n(C)$ which are invariants of the algebraic planar curve $C$. These come from analyzing the module structure of the homology of certain solvable covers of the complement of the curve $C$. These invariants are in the spirit of those developed by T. Cochran in \cite{C} and S. Harvey in \cite{H} and \cite{Har}, which were used to study knots, 3-manifolds, and finitely presented groups, respectively. We show that for curves in general position at infinity, the higher-order degrees are finite. This provides new obstructions on the type of groups that can arise as fundamental groups of complements to affine curves in general position at infinity.

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