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A three-manifold is a space that locally looks like Euclidean three-dimensional space
5
votes
Accepted
Do Heegaard Floer homology detect fibred knot in general oriented 3-manifold?
This is known for any knot in a closed, oriented 3-manifold whose complement is irreducible. Ni proved this in Knot Floer homology detects fibred knots, building on Ghiggini's proof in the genus 1 ca …
8
votes
Accepted
Hyperbolic Dehn surgeries and SU(2)-representations
All Dehn surgeries on the figure eight knot $K$ admit irreducible $SU(2)$ representations. This can be proved using Corollary 4.8 of my paper with John Baldwin, "Stein fillings and $SU(2)$ representa …
13
votes
Accepted
$0$-surgeries on trefoil and figure-eight
If you're happy bringing in heavy machinery then you could compute some sort of Floer homology, like the 'hat' version of Heegaard Floer homology: this has rank 2 for $S^3_0(3_1)$ and rank 4 for $S^3_ …
9
votes
Flat SU(2) bundles over hyperbolic 3-manifolds
The figure eight knot is hyperbolic, so by Thurston all but finitely many 1/n-surgeries on it yield hyperbolic homology spheres. The Casson invariant of the 1/n surgery is (n/2)Δ''(1), where Δ(t) = - …
8
votes
Property P and R for general 3-manifolds
The generalized Property R conjecture stated above is known for nullhomologous knots $K$ in a rational homology 3-sphere $Y$. The only surgery that can produce $Y \# (S^1\times S^2)$ is the zero-surg …
5
votes
Covering of a knot complement
Gonzalez-Acuña and Whitten answered this question for coverings by knot exteriors, as opposed to link exteriors more generally, in chapter 3 of "Imbeddings of three-manifold groups". They prove that …