Mariano Suárez-Alvarez
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22h
comment Global dimension of matrix algebra
And what is $T_n(k)$? You should reask this on math.stackexchange.com, with less exclamation marks and more details ---in particular, some description of what you know would be helpful.
Jan
28
comment programming to compute kernel quotient image of a $\mathbb{Z}$-module endomorphism
Computing the homology of a complex of f.g. free abelian groups is done using the Smith Normal form. If you have a routine with computes the SNF of a matrix, then it is vey easy to do. Of course, computing the SNF is going to take a lot of time...
Dec
30
comment Grothendieck spectral sequence when one of the functors is contravariant
(Convergence has to be dealt with, at least in the general case)
Dec
6
comment How many non-isomorphic graphs of 50 vertices and 150 edges
@Brendan_McKay, I dare say that if that is an exact answer to the question in the title, it surely deserves to be expanded to an actual answer, with an explanation :-)
Dec
6
comment How many non-isomorphic graphs of 50 vertices and 150 edges
That is the exact answer for what question exactly?
Dec
6
comment “Why” are monadicity and descent related?
Monadicity is an expression of associativity; gluability, as expressed by the usual cocycle conditions, is also a form of associativity.
Nov
24
comment Are there any non-linear solutions of Cauchy's equation ($f(x+y)=f(x)+f(y)$) without assuming the Axiom of Choice?
There are some links which got somehow broken.
Nov
24
comment Information and intuition packed in the Chern character for coherent sheaves
Chern classes of vector bundles are essentially cohomological descriptions of the zero sets of sets of sections. The category of coherent sheaves are, in a sense, an "abelian envelope" of the category of vector bundles, and Chern classes on coherent sheaves are the canonical extension of Chern classes on vector bundles to the envelope.
Nov
19
comment When is a given quiver algebra a hopf algebra?
I actually meant Frobenius, not symmetric; this follows frorm a theorem of Larson and Sweedler.
Nov
19
comment When is a given quiver algebra a hopf algebra?
The algebra has to be symmetric, and that cuts downs enormously the list of candidates. I doubt there is a classification.
Nov
19
awarded  Popular Question
Nov
17
awarded  Good Answer
Nov
14
awarded  Nice Answer
Nov
3
awarded  Yearling
Oct
29
awarded  Nice Answer
Oct
27
awarded  Nice Answer
Oct
26
comment Combinatorial description of a 120-cell
This description sounds like what one would get from describing representatives for the cosets of the parabolic subgroup corresponding to an endpoint in the Coxeter diagram for the Coxeter group of the dodehedron. Maybe you can do something similar for the other group?
Oct
26
answered Epimorphisms with artinian domain
Oct
22
comment Realizing symmetric groups by diffeomorphisms
@QiaochuYuan, $d+2$ occurs with the simplex in $S^d$.
Oct
20
awarded  Good Answer