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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 …
Steven Sivek's user avatar
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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 …
Steven Sivek's user avatar
  • 6,589
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_ …
Steven Sivek's user avatar
  • 6,589
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) = - …
Steven Sivek's user avatar
  • 6,589
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 …
Steven Sivek's user avatar
  • 6,589
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 …
Steven Sivek's user avatar
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