1,067 reputation
315
bio website
location Rome, Italy
age 24
visits member for 1 year, 9 months
seen Oct 21 at 13:21

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
Jan
5
asked Principal ideal in a semigroup ring.
Jan
5
accepted Hilbert series of the polynomial ring $K[X_1, \dots, X_s]$
Dec
22
asked Hilbert series of the polynomial ring $K[X_1, \dots, X_s]$
Dec
22
accepted Write $\mathbb{R}[x]/(x^5+x^3)$ as direct product of its localizations
Dec
21
asked Write $\mathbb{R}[x]/(x^5+x^3)$ as direct product of its localizations
Dec
14
comment Topological description of an octagon with identifications.
But I need the it!
Dec
14
comment Topological description of an octagon with identifications.
Because I have to describe generators of the fundametantal group of the $2$-torus (in the standard presentation), in terms of $a,b,c,d$... How can I do it knowing that $\pi_1(T)=aba^{-1}b^{-1}cdc^{-1}d^{-1}$
Dec
14
comment Topological description of an octagon with identifications.
But how can I prove it rigorously?
Dec
14
asked Topological description of an octagon with identifications.
Dec
10
comment Affine stratification of Grassmannian $\mathbb{G}(1,\mathbb{P}^3)$
Dear @TedShifrin, could you give me some reference about examples of affine stratification? Thank you