- idUS
- Listar por autor
Listar por autor "Ucha Enríquez, José María"
Mostrando ítems 1-20 de 26
-
Ponencia
A computational approach to free divisors and logarithmic D-modules
Ucha Enríquez, José María; Castro Jiménez, Francisco Jesús (Universidad de La Rioja, Departamento de Matemáticas y Computación, 2001)We apply algorithmic techniques for comparing some D-modules associated to a kind of divisors in Cn.
-
Artículo
A computational approach to the D-module of meromorphic functions
Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (2001)Let D be a divisor in Cn. We present methods to compare the D-module of the meromorphic functions O[∗D] to some natural approximations. We show how the analytic case can be treated with computations in the Weyl algebra.
-
Artículo
A vanishing theorem for a class of logarithmic D-modules
Castro Jiménez, Francisco Jesús; Gago Vargas, J.; Hartillo Hermoso, Isabel; Ucha Enríquez, José María (Cornell University, 2007)Let OX (resp. DX) be the sheaf of holomorphic functions (resp. the sheaf of linear differential operators with holomorphic ...
-
Capítulo de Libro
Algorithmic Invariants for Alexander Modules
Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Ucha Enríquez, José María (2006)Let $G$ be a group given by generators and relations. It is possible to compute a presentation matrix of a module over a ...
-
Artículo
An algebraic approach to Integer Portfolio problems
Castro Jiménez, Francisco Jesús; Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Puerto Albandoz, Justo; Ucha Enríquez, José María (2011-05-01)Integer variables allow the treatment of some portfolio optimization problems in a more realistic way and introduce the ...
-
Artículo
An exact algebraic ϵ-constraint method for bi-objective linear integer programming based on test sets
Hartillo Hermoso, Isabel; Jiménez Tafur, Haydee; Ucha Enríquez, José María (Elsevier, 2020)A new exact algorithm for bi-objective linear integer problems is presented, based on the classic - constraint method and ...
-
Artículo
An improved test set approach to nonlinear integer problems with applications to engineering design
Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Puerto Albandoz, Justo; Ucha Enríquez, José María (Springer, 2015-11)Many problems in engineering design involve the use of nonlinearities and some integer variables. Methods based on test ...
-
Artículo
Comparison of theoretical complexities of two methods for computing annihilating ideals of polynomials
Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Ucha Enríquez, José María (2005)Let f1, . . . , fp be polynomials in C[x1, . . . , xn] and let D = Dn be the n-th Weyl algebra. We provide upper bounds ...
-
Artículo
Exact cost minimization of a series-parallel reliable system with multiple component choices using an algebraic method
Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Puerto Albandoz, Justo; Ucha Enríquez, José María (2013-11)The redundancy allocation problem is formulated minimizing the design cost for a series-parallel system with multiple ...
-
Artículo
Exact cost minimization of a series-parallel system
Castro Jiménez, Francisco Jesús; Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Ucha Enríquez, José María (Cornell University, 2012)The redundancy allocation problem is formulated minimizing the design cost for a series-parallel system with multiple ...
-
Artículo
Explicit Comparison Theorems for D -modules
Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (Elsevier, 2001)We prove in an explicit way a duality formula between two A2-modules Mlog and Mflog associated to a plane curve and we ...
-
Ponencia
Finding Multiple Solutions in Nonlinear Integer Programming with Algebraic Test-Sets
Hartillo Hermoso, Isabel; Jiménez Cobano, J.M.; Ucha Enríquez, José María (Springer, 2018)We explain how to compute all the solutions of a nonlinear integer problem using the algebraic test-sets associated to a ...
-
Artículo
Finding multiplies solutions for non-linear integer programming
Jiménez Cobano, José Manuel; Ucha Enríquez, José María (Elsevier, 2018)We explain how to compute all the solutions of a nonlinear integer problem using the algebraic test-sets associated to ...
-
Artículo
Free divisors and duality for D-modules
Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (Pleiades, 2002)The relationship between D-modules and free divisors has been studied in a general setting by L. Narváez and F.J. Calderón. ...
-
Artículo
Gröbner bases and logarithmic D-modules
Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (Elsevier, 2006)Let C[x] = C[x1, . . . , xn] be the ring of polynomials with complex coefficients and An the Weyl algebra of order n over ...
-
Artículo
Localization at hyperplane arrangements: combinatorics and D-modules
Álvarez Montaner, Josep; Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (Elsevier, 2007-10-15)We describe an algorithm deciding if the annihilating ideal of the meromorphic function 1 f , where f = 0 defines an ...
-
Artículo
Logarithmic Comparison Theorem and some Euler homogeneous free divisors
Castro Jiménez, Francisco Jesús; Ucha Enríquez, José María (American Mathematical Society, 2005)Let D, x be a free divisor germ in a complex manifold X of dimension n > 2. It is an open problem to find out which are ...
-
Tesis Doctoral
Métodos algebraicos basados en test-sets para optimización lineal entera multiobjetivo
Jiménez Tafur, Haydee (2017-09-14)En esta memoria se presenta un nuevo método algebraico para resolver de forma exacta problemas de programación multiobjetivo ...
-
Tesis Doctoral
Métodos constructivos en álgebras de operadores diferenciales
Ucha Enríquez, José María (1999) -
Capítulo de Libro
Nouvelle Cuisine for the Computation of the Annihilating Ideal of $f^s$
Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Ucha Enríquez, José María (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 ...