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Espen Nielsen

I am a Ph.D. student at Copenhagen University, in the field of algebraic topology.

I am interested in (higher) (topological) Hochschild homology and their applications to string topology and algebraic geometry.

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  • Member for 7 years, 8 months
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19 A theorem due to Gelfand and Kolmogorov Nov 1 '12
15 Is every contractible space a cone? Jan 16 '13
15 Alternative to Axler's “Linear Algebra Done Right” Nov 22 '12
11 Finding a homeomorphism $\mathbb{R} \times S^1 \to \mathbb{R}^2 \setminus \{(0,0)\}$ Jan 3 '13
11 If $m$ and $n$ are distinct positive integers, then $m\mathbb{Z}$ is not ring-isomorphic to $n\mathbb{Z}$ Jun 30 '13
11 Example of a pair of non-cobordant manifolds Jan 22 '13
10 What's a proof that the angles of a triangle add up to 180°? Jan 3 '13
9 How to construct geometrically $\sqrt[k]{n}$ for $k \in \mathbb{Z}$ and $k>2$ Jan 13 '15
9 What are good references to self study persistent homology? Oct 15 '15
8 Lesser known derivations of well-known formulas and theorems Nov 15 '14
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