32,216 reputation
1192192
bio website mate.dm.uba.ar/~aldoc9
location Buenos Aires
age 41
visits member for 5 years, 9 months
seen 14 hours ago
 

Jul
26
awarded  Good Answer
Jul
18
comment Commutative algebra books representing the edge of research
You should subscribe to arXiv announcements on that subject and, if you have access, browse MathSciNet.
Jul
16
comment Limits of complex projective varieties in the Hausdorff topology on closed subsets of CP^n
Ah. I am sorry. I thought you might be trying to be helpful. My mistake.
Jul
16
comment Limits of complex projective varieties in the Hausdorff topology on closed subsets of CP^n
But homogeneous polynomials do not "take values" on points of projective space.
Jul
10
comment Lie algebra cohomology with values in the ring of smooth functions of a $G$-manifold
The original version looked intriguing :-)
Jul
10
comment Lie algebra cohomology with values in the ring of smooth functions of a $G$-manifold
Your cocycles are just smooth maps? They are usually linear.
Jul
6
awarded  Guru
Jun
23
comment Do representations of the universal enveloping algebra $\mathrm{U}\mathfrak{su}_2$ retain the Hopf algebra structure?
In what way is your $U_J\mathfrak{su}_2$ an algebra?
Jun
23
comment Do representations of the universal enveloping algebra $\mathrm{U}\mathfrak{su}_2$ retain the Hopf algebra structure?
There are no Hopf algebras which are simple as algebras (except the ground field, of course), precisely because of the existence of the counit. On the other hand, there is no finite dimensional Hopf algebra over a field of characteristic zero with a non-zero primitive element.
May
28
awarded  Necromancer
May
27
comment Example of a $G$-sphere that is not a $G$-representation sphere
@QiaochuYuan, can a finite group not fix a smooth structure?
May
27
comment The construction of the 257gon
@FranzLemmermeyer, thanks! Do you know what the tables appearing in pictures 8 to 4 (counting from the last) are?
May
26
comment What is the exterior derivative intuitively?
@FallenApart, ah. No , I do not mean that $\Omega^1(M)$ is the module of Kähler differentials of $C^\infty(M)$ (mostly, because it isn't! :) ) The operator $d:C^\infty(M)\to\Omega^1(M)$ can be characterized in terms of its functorial properties. This is surely done in detail in the book Natural Operations in Differential Geometry by Kolar, Michor and Slovak.
May
26
comment What is the exterior derivative intuitively?
@FallenApart, I don't understand exactly what statement you mean.
May
14
awarded  Good Answer
May
13
comment Homotopy type of embeddings of circle in the plane
My guess is because the group of self-homeos of the circle has contractible identity component (a homeo lifts to a map $\mathbb R\to\mathbb R$, and the latter is a strictly increasing or decreasing function which you can deform to a linear one)
May
13
comment Homotopy type of embeddings of circle in the plane
What do you mean by embedding,exxactly? If the maps are injective then you have only two contractible components, no?
May
3
comment Singular projective variety where the Cartan homomorphism is not an isomorphism?
The Hilbert series in that situation converges to a rational function which can be evaluated at everything which is not a pole.
May
3
comment Singular projective variety where the Cartan homomorphism is not an isomorphism?
You talk about a linked question in your question but there is no link?
Apr
23
comment When does Vopěnka's principle hold?
What is $0^\sharp$? :-|