Mathematics – Geometric Topology
Scientific paper
2009-02-04
Mathematics
Geometric Topology
Final version to appear in Geometriae Dedicata
Scientific paper
We study Nielsen equivalence classes of generating pairs of Kleinian groups and HNN-extensions. We establish the following facts: - Hyperbolic 2-bridge knot groups have infinitely many Nielsen classes of generating pairs. - For any natural number N there is a closed hyperbolic 3-manifold whose fundamental group has N distinct Nielsen classes of generating pairs. - Two pairs of elements of a fundamental group of an HNN-extension are Nielsen equivalent iff they are so for the obvious reasons.
Heusener Michael
Weidmann Richard
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