A branch set linking theorem.
A Hopf Inequality for Branch Sets.
A Note on Hyperbolic 3-Manifolds of the Same Volume.
A short proof of Eilenberg and Moore’s theorem
In this paper we give a short and simple proof the following theorem of S. Eilenberg and J.C. Moore: the only injective object in the category of groups is the trivial group.
A Splitting Theorem for Manifolds.
All Knot Groups Are Metric.
An analogue of covering space theory for ranked posets.
An Exact Sequence of Braid Groups.
An introduction to the abelian Reidemeister torsion of three-dimensional manifolds
These notes accompany some lectures given at the autumn school “Tresses in Pau” in October 2009. The abelian Reidemeister torsion for -manifolds, and its refinements by Turaev, are introduced. Some applications, including relations between the Reidemeister torsion and other classical invariants, are surveyed.