Listar Artículos (Matemática Aplicada I) por autor 

Listar Artículos (Matemática Aplicada I) por autor "Armario Sampalo, José Andrés"                

Mostrando ítems 21-35 de 35

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      On an inequivalence criterion for cocyclic Hadamard matrices 

      Armario Sampalo, José Andrés (Springer, 2010)
      Given two Hadamard matrices of the same order, it can be quite difficult to decide whether or not they are equivalent. ...
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      On Cocyclic Hadamard Matrices over Goethals-Seidel Loops 

      Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (MDPI, 2020)
      About twenty-five years ago, Horadam and de Launey introduced the cocyclic development of designs, from which the notion ...
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      On D4t-Cocyclic Hadamard Matrices 

      Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (Wiley, 2016)
      In this paper, we describe some necessary and sufficient conditions for a set of coboundaries to yield a cocyclic Hadamard ...
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      On higher dimensional cocyclic Hadamard matrices 

      Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Real Jurado, Pedro (2015)
      Provided that a cohomological model for G is known, we describe a method for constructing a basis for n-cocycles over G, ...
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      On p-minimal homological models of twisted tensor products of elementary complexes localised over a prime 

      Armario Sampalo, José Andrés; Real Jurado, Pedro; Silva Gallardo, Beatriz (American Mathematical Society, 1999)
      In this paper, working over Z(p) and using algebra perturbation results from [18], p-minimal homological models of twisted ...
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      On permanents of Sylvester Hadamard matrices 

      Armario Sampalo, José Andrés (Cornell University, 2013)
      It is well-known that the evaluation of the permanent of an arbitrary (−1, 1)- matrix is a formidable problem. Ryser’s ...
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      On quasi-orthogonal cocycles 

      Armario Sampalo, José Andrés; Flannery, D. L. (Wiley, 2017)
      We introduce the notion of quasi-orthogonal cocycle. This is motivated in part by the maximal determinant problem for ...
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      On Skew E–W Matrices 

      Armario Sampalo, José Andrés; Frau García, María Dolores (Wiley, 2016)
      An E–W matrix M is a ( − 1, 1)-matrix of order urn:x-wiley:10638539:media:jcd21519:jcd21519-math-0001, where t is a positive ...
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      On the Smith normal form of skew E-W matrices 

      Armario Sampalo, José Andrés (Taylor and Francis, 2017)
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      Quasi-Hadamard Full Propelinear Codes 

      Armario Sampalo, José Andrés; Bailera, Iván; Borges, Joachim; Rifá, Josep (Springer, 2018)
      In this paper, we give a characterization of quasi-Hadamard groups in terms of propelinear codes. We define a new class ...
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      Quasi-orthogonal cocycles, optimal sequences and a conjecture of Littlewood 

      Armario Sampalo, José Andrés; Flannery, D. L. (Springer, 2020)
      A quasi-orthogonal cocycle, defined over a group of order congruent to 2 modulo 4, is naturally analogous to an orthogonal ...
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      Self-Dual codes from (−1,1)-matrices of skew symmetric type 

      Armario Sampalo, José Andrés; Frau García, María Dolores (Cornell University, 2013)
      Previously, self-dual codes have been constructed from weighing matrices, and in particular from conference matrices (skew ...
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      The homological reduction method for computing cocyclic Hadamard matrices 

      Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Real Jurado, Pedro (2009)
      An alternate method for constructing (Hadamard) cocyclic matrices over a finite group GG is described. Provided that a ...
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      The maximal determinant of cocyclic (−1, 1)-matrices over D2t 

      Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix (Elsevier, 2012)
      Cocyclic construction has been successfully used for Hadamard matrices of order n. These -matrices satisfy that and give ...
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      Transferring TTP-structures via contraction 

      Frau García, María Dolores; Real Jurado, Pedro; Armario Sampalo, José Andrés; Álvarez Solano, Víctor (2005)