Now showing items 163-182 of 209

    • IconSearching for simultaneous arithmetic progressions on elliptic curves  [Article]

      García Selfa, Irene; Tornero Sánchez, José María (Australian Mathematical Society, 2005-06)
      We look for elliptic curves featuring rational points whose coordinates form two arithmetic progressions, one for each coordinate. A constructive method for creating such curves is shown, for lengths up to 5.
    • IconSecondary homotopy groups  [Article]

      Baues, Hans Joachim; Muro Jiménez, Fernando (De Gruyter, 2008-07)
      Secondary homotopy groups supplement the structure of classical homotopy groups. They yield a track functor on the track category of pointed spaces compatible with fiber sequences, suspensions and loop spaces. They also ...
    • IconSemblanza del profesor don Gonzalo Sánchez Vázquez  [Article]

      Pérez Jiménez, Antonio de Jesús (Federación Española de Profesores de Matemáticas, 1997-06)
    • IconSmash products for secondary homotopy groups  [Article]

      Bauer, Hans Joachim; Muro Jiménez, Fernando (Springer, 2008-10)
      We construct a smash product operation on secondary homotopy groups yielding the structure of a lax symmetric monoidal functor. Applications on cup-one products, Toda brackets and Whitehead products are considered.
    • IconSolving the conjugacy problem in Garside groups by cyclic sliding  [Article]

      Gebhardt, Volker; González-Meneses López, Juan (Elsevier, 2010-06)
      We present a solution to the conjugacy decision problem and the conjugacy search problem in Garside groups, which is theoretically simpler than the usual one, with no loss of efficiency. This is done by replacing the well ...
    • IconSome combinatorial remarks on normal flatness in analytic spaces  [Article]

      Soto Prieto, Manuel Jesús; Tornero Sánchez, José María (Mathematical Society of the Republic of China, 2014-06)
      In this article we present a combinatorial treatment of normal flatness in analytic spaces, using the idea of equimultiple standard bases. We will prove, using purely combinatorial methods, a characterization theorem for ...
    • IconSome geometric aspects of Puiseux surfaces  [Article]

      Tornero Sánchez, José María (European Mathematical Society, 2003)
      The following problem is treated: Characterizing the tangent cone and the equimultiple locus of a Puiseux surface (that is, an algebroid embedded surface admitting an equation whose roots are Puiseux power series), using ...
    • IconSpecializations of MacMahon symmetric functions and the polynomial algebra  [Article]

      Rosas Celis, Mercedes Helena (Elsevier, 2002-03-06)
      A MacMahon symmetric function is a formal power series in a finite number of alphabets that is invariant under the diagonal action of the symmetric group. We use a combinatorial construction of the different bases of the ...
    • IconStrongly quasipositive links with braid index 3 have positive Conway polynomial  [Article]

      Silvero Casanova, Marithania (World Scientific, 2016-10)
      Strongly quasipositive links are those links which can be seen as closures of positive braids in terms of band generators. In this paper we give a necessary condition for a link with braid index 3 to be strongly quasipositive, ...
    • IconSudokus and Gröbner Bases: not only a Divertimento  [Chapter of Book]

      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 is equivalent to a (big) algebraic system of polynomial equations. We study how far Gröbner bases techniques ...
    • IconSumando la derivada de la serie geométrica  [Article]

      Boulton, Lyonell; Rosas Celis, Mercedes Helena (Asociación Matemática Venezolana, 2003)
    • IconSur l’irréductibilité d’une induite parabolique  [Article]

      Mínguez Espallargas, Alberto (De Gruyter, 2009)
      Let F be a non-Archimedean locally compact field and let D be a central division algebra over F. Let p1 and p2 be respectively two smooth irreducible representations of GLðn1; DÞ and GLðn2; DÞ, n1; n2 f0. In this article, ...
    • IconSymmetric functions in noncommuting variables  [Article]

      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. The subalgebra Π(x1, x2, . . .) of symmetric functions in noncommuting variables consists of all ...
    • IconTame Galois realizations of GSp4 (Fℓ) over Q  [Article]

      Arias de Reyna Domínguez, Sara; Vila Oliva, Núria (Oxford University Press, 2011)
      In this paper we obtain realizations of the 4-dimensional general symplectic group over a prime field of characteristic ℓ > 3 as the Galois group of a tamely ramified Galois extension of Q. The strategy is to consider ...
    • IconThe 1-type of a Waldhausen K-theory spectrum  [Article]

      Muro Jiménez, Fernando; Tonks, Andrew (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.
    • IconThe algebra of secondary homotopy operations in ring spectra  [Article]

      Baues, Hans Joachim; Muro Jiménez, Fernando (London Mathematical Society, 2011)
      The primary algebraic model of a ring spectrum R is the ring π∗R of homotopy groups. We introduce the secondary model π∗,∗R which has the structure of a secondary analogue of a ring. The homology of π∗,∗R is π∗R and ...
    • IconThe analytic standard fan of a D-module  [Article]

      Assi, Abdallah; Castro Jiménez, Francisco Jesús; Granger, Michel (Elsevier, 2001-10-24)
      We extend to the analytic D-module case our results in the algebraic case, namely, we associate with any monogeneous module over the ring D of germs of linear differential operators at the origin of Cn, with holomorphic ...
    • IconThe characteristic cohomology class of a triangulated category  [Article]

      Baues, Hans Joachim; Muro Jiménez, Fernando (2005)
      The concept of a triangulated homotopy category can be canonically lifted to the level of a groupoid-enriched category. This way two natural axioms on track triangles replace the four somewhat obscure axioms of a triangulated ...
    • IconThe computation of the logarithmic cohomology for plane curves  [Article]

      Castro Jiménez, Francisco Jesús; Takayama, Nobuki (Elsevier, 2009-12-01)
      We will give algorithms of computing bases of logarithmic cohomology groups for square-free polynomials in two variables.
    • IconThe conservation relation for cuspidal representations  [Article]

      Mínguez Espallargas, Alberto (Springer, 2012-01)
      Let π ∈ Cusp (U(Vn)) be a smooth cuspidal irreducible representation of a unitary group U(Vn) of dimension n over a non-Archimedean locally compact field. Let W± m the two isomorphism classes of Hermitian spaces of dimension ...