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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).

3 votes
1 answer
315 views

A detail in Brown's proof of the generalized Schoenflies theorem

Consider a homeomorphic embedding $h:S^{n-1}\times [0,1]\rightarrow S^n$ and denote $$S^{n-1}_t=h(S^{n-1}\times \{t\}).$$ The generalized Schoenflies theorem states the closure of each connected compo …
Nikhil Sahoo's user avatar
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2 votes
1 answer
213 views

Link invariants distinguishing components

I was recently thinking about links where each component plays the same role: for every permutation of components, there is an isotopy permuting these components in the prescribed way. In the vein of …
Nikhil Sahoo's user avatar
  • 1,225
2 votes
Accepted

A detail in Brown's proof of the generalized Schoenflies theorem

Update: The argument I previously provided was incorrect. I will now outline a correct argument, followed by the incorrect argument and an explanation of what went wrong. Correct Explanation: By Alexa …
Nikhil Sahoo's user avatar
  • 1,225