1,109 reputation
315
bio website
location Rome, Italy
age 24
visits member for 1 year, 11 months
seen Dec 15 at 11:19

Nov
27
comment Lie Group Automorphism which are diffeomorphism
If you need you can consider $G$ compact and $dim(G)< \infty$
Nov
27
asked Lie Group Automorphism which are diffeomorphism
Nov
27
comment Projection of $H^1([0,1])$ on its subspace .
How can I prove that there is not a closed formula for such a projection ?
Nov
26
comment Projection of $H^1([0,1])$ on its subspace .
Thank you very much!
Nov
26
comment Projection of $H^1([0,1])$ on its subspace .
Obviously the second... I'd like to calculate $\pi(f)$, given $f$.
Nov
26
asked Projection of $H^1([0,1])$ on its subspace .
Nov
17
accepted Dimension of secant variety
Nov
16
asked Find ideal defining $Gr_2(\mathbb{C}^5)$ in Pluker embedding
Nov
12
comment Dimension of secant variety
Sorry! $X$ is embedded in $\mathbb{P}^{g+d-1}$
Nov
12
asked Dimension of secant variety
Oct
12
asked Koszul complex and locally free resolution
Oct
6
asked extension maps moduli space
Sep
8
comment Grothendieck Riemann Roch, universal bundle on $SU_C(2,L)$
The question is how to prove that $c_1(\pi_*(U))=-\omega+(d+2-2g)\phi$ knowing that for $c_1(U)$ and $c_2(U)$ there are those decomposition.
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Apr
5
comment Vector bundles on elliptic curves
First of all, thank you for the answer. Now, I know that it is sufficient to prove that $G$ is indecomposable because $r$ and $r+d$ are coprime. But what I can't understand is the reason why $G$ is indecomposable. Why does this extension force $G$ to be indecomposable. And, is it true that $H^0(F) \otimes O_X$ is semistable?
Apr
4
asked Vector bundles on elliptic curves
Feb
10
comment $K$-theory exact sequence.
But my problem is not the proof of the exactness in the middle (that is always true) but the exactness at the left of this sequence $0 \to K(X,Y) \to K(X) \to K(Y) \to 0.$
Feb
10
comment $K$-theory exact sequence.
But, how can I prove that the first map is iniective?
Jan
16
awarded  Yearling