On the connection between fundamental groups and pencils with multiple fibers

Details On the connection between fundamental groups and pencils with multiple fibers On the connection between fundamental groups and pencils with multiple fibers

2010-02-10

arxiv.org/abs/1002.2097v1

Mathematics

Algebraic Geometry

Scientific paper

We present two results about the relationship between fundamental groups of quasiprojective manifolds and linear systems on a projectivization. We prove the existence of a plane curve with non-abelian fundamental group of the complement which does not admit a mapping onto an orbifold with non-abelian fundamental group. We also find an affine manifold whose irreducible components of its characteristic varieties do not come from the pull-back of the characteristic varieties of an orbifold.

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