5,235 reputation
21439
bio website iazd.uni-hannover.de/…
location Hanover, Germany
age 30
visits member for 5 years, 1 month
seen 1 hour ago

I am a postdoc at the Leibniz Universität Hannover. I specialise in arithmetic geometry, algebraic number theory and analytic number theory.


1d
comment Cohomology of Homogeneous Complex Manifolds
In the question $G$ is a semi-simple algebraic group, which does not seem to be the case for your "counter-example".
2d
awarded  Custodian
2d
reviewed Approve Brauer group elements associated to conic bundles
May
21
comment K3 surface as an anticanonical section
One comes close with the following example: Consider $V = S \times \mathbb{P}^1$. Here each anticanonical divisor is isomorphic to either two copies of $S$ or $S$ doubled.
May
19
comment Numbers represented by inhomogeneous forms
To those people who are voting to close: could you please explain why? Perhaps I am missing something, but this question seems non-trivial to me.
May
6
comment Backlund counting formula for Dirichlet L-functions?
I'm voting to close this question as off-topic because it's no longer relevant.
Apr
27
comment The topology of Fano schemes of lines
@Jason: You must be missing some cases. For example, the Fano scheme of lines on a smooth cubic threefold is a smooth surface with non-trivial fundamental group, however this does not appear in the list which you give.
Apr
27
revised Random Diophantine polynomials: Percent solvable?
deleted 18 characters in body
Apr
27
answered Random Diophantine polynomials: Percent solvable?
Apr
26
revised Density of polynomials which are soluble with respect to a set of primes
added 4 characters in body
Apr
26
answered Density of polynomials which are soluble with respect to a set of primes
Apr
26
revised Why are solutions to $\sqrt[k]{x_1^k+x_2^k+x_3^k+x_4^k}$ for $k=2,3$ curiously smooth?
edited tags
Apr
23
comment A question about Weil restriction
@AllyMath: I don't really have an answer, only an idea how one would calculate it. Why do you want an explicit description so much anyway? Often in applications one only needs to know the cohomology, which one can easily calculate using the Leray spectral sequence.
Apr
23
comment A question about Weil restriction
Calculating the Weil restriction of a constant group scheme should be similar to calculating the pushforward of the structure sheaf $\pi_* \mathcal{O}_C$. You should get some complicated answer in terms of things like the ramification data of the cover. A simpler thing to understand is the generic fibre of this, which is just the Weil restriction of a constant group scheme with respect to a quadratic field extension.
Apr
20
comment Stabilisers of group actions
This seems pretty cool, however it is so technical I'm struggling to understand it. Is it possible to give an intuitive idea of where it comes from? Is this a standard example or your own example? Is it perhaps related to some kind of moduli problem or something in GIT?
Apr
19
accepted Stabilisers of group actions
Apr
19
comment Stabilisers of group actions
This is great, thanks! Out of interest, do you happen to know an example for which the answer to my question is no? e.g. for some non-reductive group $G$ which acts with non-closed orbits?.
Apr
19
asked Stabilisers of group actions
Apr
6
answered Dirichlet series without order term
Apr
6
comment Dirichlet series without order term
Could you please clarify what you mean by "Dirichlet series without the order term"? Do you mean series of the shape $\sum_{n=-\infty}^\infty a_n/n^s$?