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Topology of cell complexes and manifolds, classification of manifolds (e.g. smoothing, surgery), low dimensional topology (e.g. knot theory, invariants of 4-manifolds), embedding theory, combinatorial and PL topology, geometric group theory, infinite dimensional topology (e.g. Hilbert cube manifolds, theory of retracts).

10 votes
Accepted

If $M$ is contractible manifold and $X\subset \partial M$, does the cone over $X$ embed in $M$?

Not in the PL case - this follows from the results of "Knot concordance in homology cobordisms" by Hom, Levine, and Lidman. They prove that for many pairs of a 3-manifold $Y$ and knot $K \subset Y$, a …
William Ballinger's user avatar
4 votes
Accepted

What are the possible linking matrices of a quasi-positive link?

There seem to be hardly any restrictions on the linking matrices you can get from a quasipositive link. For example, this construction shows that everything except the first row and column of the link …
William Ballinger's user avatar
2 votes

Presenting 3-manifolds by planar graphs

I'm pretty sure that the answers to Question 1 and part of Question 2 are no, and this does come from looking at double branched covers. There are examples due to Watson (1) of pairs of knots with di …
William Ballinger's user avatar