Search
Now showing items 1-10 of 109
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
The symmetric action on secondary homotopy groups
(The Belgian Mathematical Society, 2008-11)
We show that the symmetric track groups Sym(n), which are extensions of the symmetric groups Sym(n) associated to the second Stiefel-Whitney class, act as crossed modules on the secondary homotopy groups of a pointed space.
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
Equimultiple locus of embedded algebroid surfaces and blowing-up in arbitrary characteristic
(Chinese Academy of Sciences, 2009-12)
This paper extends previous results of the authors, concerning the behaviour of the equimultiple locus of algebroid surfaces under blowing–up, to arbitrary characteristic.
PhD Thesis
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
Álgebras de semigrupos y aplicaciones
(2000-06-29)
Dado un semigrupo abeliano, cancelativo,finitamente generado y con elemento neutro, S, y un cuerpo k,podemos considerar el álgebra S-graduada k[S]. El estudio de esta álgebra tiene un gran interes dentro de la ...
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
Computing the rational torsion of an elliptic curve using Tate normal form
(Elsevier, 2002-09)
It is a classical result (apparently due to Tate) that all elliptic curves with a torsion point of order n (4 ≤ n ≤ 10, or n = 12) lie in a oneparameter family. However, this fact does not appear to have been used ever for ...
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
Linearity conditions on the Jacobian ideal and logarithmic--meromorphic comparison for free divisors
(Cornell University, 2008-04-14)
In this paper we survey the role of D-module theory in the comparison between logarithmic and meromorphic de Rham complexes of integrable logarithmic connections with respect to free divisors, and we present some new ...
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
The module Dfs for locally quasi-homogeneous free divisors
(Springer, 2002-10)
We find explicit free resolutions for the D-modules Dfs and D[s]fs/D[s]f s+1, where f is a reduced equation of a locally quasi-homogeneous free divisor. These results are based on the fact that every locally quasi-homogeneous ...
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
Representation theory of some infinite-dimensional algebras arising in continuously controlled algebra and topology
(Springer, 2004)
In this paper we determine the representation type of some algebras of infinite matrices continuously controlled at infinity by a compact metrizable space. We explicitly classify their finitely presented modules in the ...
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
On the cycling operation in braid groups
(Elsevier, 2008-09-06)
The cycling operation is a special kind of conjugation that can be applied to elements in Artin’s braid groups, in order to reduce their length. It is a key ingredient of the usual solutions to the conjugacy problem in ...
Article
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
The 1-type of a Waldhausen K-theory spectrum
(Elsevier, 2007-12-01)
We give a small functorial algebraic model for the 2-stage Postnikov section of the K-theory spectrum of a Waldhausen category and use our presentation to describe the multiplicative structure with respect to biexact functors.
Chapter of Book
![With access to the full text Icon](/themes/idUS//images/acceso/opened_access.png)
Nouvelle Cuisine for the Computation of the Annihilating Ideal of $f^s$
(2005)
Let $f_1,\ldots, f_p$ be polynomials in ${\bf C}[x_1,\ldots, x_n]$ and let $D = D_n$ be the $n$-th Weyl algebra. The annihilating ideal of $f^s=f_1^{s_1}\cdots f_p^{s_p}$ in $D[s]=D[s_1,\ldots,s_p]$ is a necessary step ...