2,651 reputation
1725
bio website math.unibas.ch/~blanc
location Basel
age 32
visits member for 2 years, 3 months
seen 45 mins ago

I am working mostly in birational geometry, especially in studying Cremona groups.


6h
awarded  Enlightened
7h
awarded  Nice Answer
Aug
24
comment Pseudo-automorphisms on Fano varieties
Thanks for the nice answer.
Aug
22
comment Pseudo-automorphisms on Fano varieties
Thanks everybody for your help.
Aug
22
accepted Pseudo-automorphisms on Fano varieties
Aug
22
comment Pseudo-automorphisms on Fano varieties
Yes, the degree of a birational map $\mathbb{P}^n\dashrightarrow \mathbb{P}^n$ is the degree of the polynomials (given without common factors), and is also the induced map on the Picard group. @JasonStarr, Could you explain more what you mean with Hartog's Theorem / S2 extension in this context? I google it and did not understand exactly what you meant.
Aug
21
asked Pseudo-automorphisms on Fano varieties
Aug
2
reviewed Approve suggested edit on Existence of a family of elliptic curves with large torsion subgroup
Jul
31
answered Is there an algorithm to write down the 27 lines of a cubic surface?
Jul
27
reviewed Approve suggested edit on Discriminant and Different
Jul
23
asked Factors of the polynomial $X^n-a$
Jul
21
reviewed Approve suggested edit on How to think about CM rings?
Jul
20
reviewed Reject suggested edit on nontrivial theorems with trivial proofs
Jul
11
revised Automorphisms of a specific type of weighted projective space
edited body
Jul
9
reviewed Approve suggested edit on Pullback map in homology
Jul
2
awarded  Curious
Jun
11
reviewed Approve suggested edit on Finite groups with trivial Frattini subgroup
Jun
8
reviewed Approve suggested edit on A generalization of the Weil reciprocity law in a case of any two sections of line bundles on a curve
Jun
5
comment Is every element of $\mathrm{SL}(n,R)$ of finite order diagonalizable?
Thanks for the comment. Do you have some explicit example for $E,L,R$ ?
Jun
3
comment Elements of finite order of $\mathrm{PGL}(n,\mathbb{Q})$
Yes, good question. I do not know...