bio | website | mathematik.uni-mainz.de/… |
---|---|---|
location | Mainz | |
age | 27 | |
visits | member for | 5 years, 6 months |
seen | Aug 19 at 16:07 | |
stats | profile views | 2,907 |
Post-doc at Johannes-Gutenberg UniversitÃ¤t Mainz. Interested in many things, but especially arithmetic geometry.
Aug
17 |
comment |
Isotrivial families with non-zero Kodaira spencer map
@JasonStarr How can one get rid of the assumption on the characteristic of $k$? It seems to me that if, for instance, the morphism $\pi$ were finite type, we don't need $k$ to be of characteristic zero. Does that seem right to you? |
Aug
17 |
comment |
Isotrivial families with non-zero Kodaira spencer map
@JasonStarr You wrote "Since k is algebraically closed, there exists a dense open subscheme of I that is k-scheme." Did you mean to write "Since $k$ is algebraically closed and of characteristic zero, there exists a smooth dense open subscheme of $I$ over $k$"? |
Aug
7 |
comment |
Is a morphism whose all fibers are $\mathbf{P}^n$ a projective bundle?
@grghxy That is indeed very beautiful. Thank you. |
Aug
7 |
revised |
Is a morphism whose all fibers are $\mathbf{P}^n$ a projective bundle?
deleted 24 characters in body |
Aug
7 |
comment |
Is a morphism whose all fibers are $\mathbf{P}^n$ a projective bundle?
@grghxy Thank you for your comment as well. I added this to the "answer". I really feel like the OP might find this useful, so I'm not deleting it unless it turns out to be completely wrong. :) |
Aug
7 |
revised |
Is a morphism whose all fibers are $\mathbf{P}^n$ a projective bundle?
my answer didn't answer the question. I left my comments for the OP, as they might be useful. |
Aug
7 |
comment |
Is a morphism whose all fibers are $\mathbf{P}^n$ a projective bundle?
@JasonStarr Thank you for your comment. I read the question too quickly. I will edit the "answer" accordingly. Why does the Isom-scheme argument only apply if the morphism is projective? |
Aug
7 |
answered | Is a morphism whose all fibers are $\mathbf{P}^n$ a projective bundle? |
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. |