Now showing items 61-80 of 260

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      Algebraic computation of some intersection D-modules 

      Calderón Moreno, Francisco Javier; Narváez Macarro, Luis (Springer, 2006)
      Let X be a complex analytic manifold, D ⊂ X a locally quasi-homogeneous free divisor, E an integrable logarithmic connection ...
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      Grothendieck bialgebras, Partition lattices, and symmetric functions in noncommutative variables 

      Bergeron, Nantel; Hohlweg, Christophe; Rosas Celis, Mercedes Helena; Zabrocki, Mike (American Mathematical Society, 2006)
      We show that the Grothendieck bialgebra of the semi-tower of partition lattice algebras is isomorphic to the graded dual ...
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      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 ...
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      Sudokus and Gröbner Bases: not only a Divertimento 

      Gago Vargas, Manuel Jesús; Hartillo Hermoso, Isabel; Martín Morales, Jorge; Ucha Enríquez, José María (2006)
      Sudoku is a logic-based placement puzzle. We recall how to translate this puzzle into a 9-colouring problem which ...
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      Symmetric functions in noncommuting variables 

      Rosas Celis, Mercedes Helena; Sagan, Bruce E. (American Mathematical Society, 2006)
      Consider the algebra Qhhx1, x2, . . .ii of formal power series in countably many noncommuting variables over the rationals. ...
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      Purity of exponential sums on An 

      Rojas León, Antonio (Kluwer, 2006-03)
      We give a purity result for two kinds of exponential sums of the type ∑x∈knψ(f(x)), where k is a finite field of characteristic ...
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      On the functoriality of cohomology of categories 

      Muro Jiménez, Fernando (Elsevier, 2006-03)
      In this paper we show that the Baues-Wirsching complex used to define cohomology of categories is a 2-functor from a certain ...
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      Inequalities between Littlewood–Richardson coefficients 

      Bergeron, François; Biagioli, Riccardo; Rosas Celis, Mercedes Helena (Elsevier, 2006-05)
      We prove that a conjecture of Fomin, Fulton, Li, and Poon, associated to ordered pairs of partitions, holds for many ...
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      Moment zeta functions for toric Calabi-Yau hypersurfaces 

      Rojas León, Antonio; Wan, Daqing (International Press, 2007)
      Moment zeta functions provide a diophantineformulation for the distribution of rational points on afamily of algebraic ...
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      Conjugacy in Garside groups I: Cyclings, powers, and rigidity 

      Birman, Joan S.; Gebhardt, Volker; González-Meneses López, Juan (European Mathematical Society, 2007)
      In this paper a relation between iterated cyclings and iterated powers of elements in a Garside group is shown. This yields ...
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      Resolutions of De Concini-Procesi ideals of hooks 

      Biagioli, Riccardo; Faridi, Sara; Rosas Celis, Mercedes Helena (Taylor & Francis, 2007)
      We find a minimal generating set for the defining ideal of the schematic intersection of the set of diagonal matrices with ...
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      A flatness property for filtered D-modules 

      Castro Jiménez, Francisco Jesús; Granger, Michel (European Mathematical Society, 2007)
      Let M be a coherent module over the ring DX of linear differential operators on an analytic manifold X and let Z1, · · · ...
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      Pilar Pisón Casares, in memoriam 

      Ojeda Martínez de Castilla, Ignacio; Piedra Sánchez, Ramón (Real Sociedad Matematica Española, 2007)
      Estamos habituados a describir objetos matemáticos, a elaborar teorías, conjeturar resultados, demostrar asertos o refutar ...
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      Rank one discrete valuations of power series fields 

      Herrera Govantes, Francisco Javier; Olalla Acosta, Miguel Ángel; Vicente Córdoba, José Luis (Taylor & Francis, 2007)
      In this paper we study rank one discrete valuations of the field k((X1, . . . , Xn)) whose center in k[[X1, . . . , Xn]] ...
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      Purity of exponential sums on An, II 

      Rojas León, Antonio (De Gruyer, 2007-03)
      We give a purity result for exponential sums of the type P x∈kn ψ(f(x)), where k is a finite field of characteristic p, ...
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      Hironaka's characteristic polygon and effective resolution of surfaces 

      Piedra Sánchez, Ramón; Tornero Sánchez, José María (Elsevier, 2007-03-01)
      Hironaka’s concept of characteristic polyhedron of a singularity has been one of the most powerful and fruitful ideas of ...
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      Valuations in algebraic field extensions 

      Herrera Govantes, Francisco Javier; Olalla Acosta, Miguel Ángel; Spivakovsky, Mark (Elsevier, 2007-06-15)
      Let K → L be an algebraic field extension and ν a valuation of K. The purpose of this paper is to describe the totality ...
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      Computational methods in algebra and analysis 

      Castro Jiménez, Francisco Jesús (Sociedad Española de Matemática Aplicada, 2007-09)
      This paper describes some applications of Computer Algebra to Algebraic Analysis also known as D-module theory, i.e. the ...
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      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 ...
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      Conjugacy in Garside Groups III: Periodic braids 

      Birman, Joan S.; Gebhardt, Volker; González-Meneses López, Juan (Elsevier, 2007-10-15)
      An element in Artin’s braid group Bn is said to be periodic if some power of it lies in the center of Bn. In this paper ...