The Virtually Fibred ConjectureVirtually Fibred Conjecture, and related problems.
For a weaker definition of 3-manifold topology, I think the Andrews-Curtis conjectureAndrews-Curtis conjecture is a key problem. Also, anything which relates to the classification of non-simply-connected topological 4-manifolds, for instance problems related to knot and link concordance.
Martin Sleziak
- 4.7k
- 4
- 35
- 40