Johannes Hahn

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Name Johannes Hahn
Member for 3 years
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Location Jena, Germany
Age 26
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15
Problems where we can’t make a canonical choice, solved by looking at all choices at once
14
Can we actually find any fixed points with Brouwer’s theorem?
14
Interesting applications (in pure mathematics) of first-year calculus
7
Why are tensors a generalization of scalars, vectors, and matrices?
7
Sp(2n) intersect Sp(2n,H)? (Please read for explanation of notation)
7
Decidability of the Axiom of Choice
7
Is there a polynomial equation whose solution over the integers is independent of ZFC
6
modular exponentation for RSA, why is 2^16 + 1 commonly chosen?
6
Are there alternative proofs for existence/uniqueness of ODE solutions?
6
Moser iteration for elliptic systems
5
Why don’t ideals and quotients work well for categories?
5
Weak and Strong Integration of vector-valued functions
5
Manifold-Valued Sobolev Spaces
4
When does a symmetric algebra over a field of characteristic 0 fail to be semisimple?
4
Generalized notions of solutions in various areas of mathematics
4
Conditions on a metric space so that boundedness implies total boundedness
4
List of centers of finite groups
4
Homology with Coefficients
4
Rank of ABA where B is positive definite
4
Is it true that the only interesting topologies are metric topologies and weak topologies?
4
Taking lecture notes in lectures
3
A good place where to learn about derived functors
3
Graph properties, categorically defined
3
Algebra with positive definite symmetrizing trace is semisimple.
3
Spectrum and scheme of the commutative group-algebra of an abelian group.
2
Irreducibility of Coxeter Graphs as a Function of Generating Sets
2
endomorphism rings of indecomposable objects
2
Is there a formula for the size of Symplectic group defined over a ring $Z/p^k Z$?
2
What are some examples of colorful language in serious mathematics papers?
2
Why free topological groups on Tychonoff spaces?
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