3,292 reputation
1938
bio website mathematik.uni-mainz.de/…
location Mainz
age 27
visits member for 5 years, 5 months
seen Jul 29 at 13:32

Post-doc at Johannes-Gutenberg Universität Mainz. Interested in many things, but especially arithmetic geometry.


Jul
21
comment Automorphisms of del Pezzo surfaces
I think the discussion on the bottom of page 36 of jlms.oxfordjournals.org/content/s2-32/1/31.full.pdf might be useful to you.
Jun
23
comment Excellent rings
Note that Example 13 in Koll\'ar's paper also gives an example with $A$ regular, but only in characteristic two.
Jun
16
revised Are all these K3 surfaces supersingular?
Added tags because this question didn't get any attention (probably because it wasn't tagged well)
Jun
9
revised Families of Fano varieties over non-hyperbolic curves
typos corrected
Jun
9
revised Families of Fano varieties over non-hyperbolic curves
deleted 430 characters in body
May
27
answered Obstruction to get a galois invariant cycle
May
18
reviewed Approve What is prime power of this equation of p?
May
15
revised Abelian varieties with good reduction everywhere over function fields
Added a sentence to explain second paragraph of answer
May
15
reviewed Approve Kernel of flux homomorphism (Calabi invariant) for volume-preserving maps on a compact manifold
May
12
reviewed Approve Algebraic proof of Five-Color Theorem using chromatic polynomials by Birkhoff and Lewis in 1946
May
12
reviewed Approve Question about a divisor and its image
May
6
comment Do line bundles descend to coarse moduli spaces of Artin stacks with finite inertia?
Dear @ZsoltPatakfalvi, you're right. That's not a good test case.
May
5
comment Do line bundles descend to coarse moduli spaces of Artin stacks with finite inertia?
@ZsoltPatakfalvi Is this true for the stack of smooth curves of genus one $\mathcal M_1$? Note that $\mathcal M_1$ is a smooth separated finite type Artin (but not DM) stack over $\mathbb Z$.
May
5
comment manifold branched covering space for orbifolds
In the algebraic setting every smooth orbifold is a global quotient stack; see Thm 2.18 in arxiv.org/pdf/math/9905049v3.pdf
May
5
comment manifold branched covering space for orbifolds
I'm a bit confused. You write "Not every orbifold is a global quotient", but then later you write "every orbifold is a global quotient $M/G$.
Apr
22
revised Separation condition for higher Deligne-Mumford stacks
deleted 3 characters in body
Apr
22
revised Finiteness of the connected components of a stack
edited title
Mar
29
comment When does an algebraic space that is a torsor over a scheme have to be a scheme?
Check out arxiv.org/abs/1501.04304 .
Mar
24
revised Abelian varieties with good reduction everywhere over function fields
edited tags
Mar
24
answered Abelian varieties with good reduction everywhere over function fields