Non-commutative Multivariable Reidemeister Torsion and the Thurston Norm
Abstract
In a previous paper, the second author defined integer-valued functions deltan on the first cohomology of a 3-manifold, generalizing McMullen's Alexander norm. It was shown that these functions give lower bounds on the Thurston norm. In this paper, we reformulate these invariants in terms of Reidemeister torsion over a non-commutative multivariable Laurent polynomial ring. This allows us to show that these functions are semi-norms.
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