activity
20142020
most citedA survey of the foundations of four-manifold theory in the topological category

56 citations · 130 across the 13 of their papers we have counts for

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Showing 2014Show all

3 papers · 1 filter

math.GT2014

3-manifolds that can be made acyclic

Stefan Friedl, Matthias Nagel

We determine which 3-manifolds admit a unitary representation such that the corresponding twisted chain complex is acyclic.

math.GT2014

A specious unlinking strategy

Stefan Friedl, Matthias Nagel, Mark Powell

We show that the following unlinking strategy does not always yield an optimal sequence of crossing changes: first split the link with the minimal number of crossing changes, and t…

math.GT2014★ 8 cited

Minimal genus in circle bundles over 3-manifolds

Matthias Nagel

An estimate for the genus function in circle bundles over irreducible 3-manifolds is proven. This estimate is in many cases an equality and it relates the minimal genus of the surf…