Now showing items 228-247 of 314

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      Quasi-filiform Leibniz algebras of maximum length  [Article]

      Camacho Santana, Luisa María; Cañete Molero, Elisa María; Gómez Martín, José Ramón; Omirov, Bakhrom Abdazovich (Springer, 2011)
      The n-dimensional p-filiform Leibniz algebras of maximum length have already been studied with 0 p 2. For Lie algebras whose nilindex is equal to n − 2 there is only one characteristic sequence, (n − 2, 1, 1), while ...
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      Quasi-Hadamard Full Propelinear Codes  [Article]

      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 of codes that we call quasi-Hadamard full propelinear codes. Some structural properties of these ...
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      Quasipolynomial formulas for the Kronecker coefficients indexed by two two-row shapes (extended abstract)  [Article]

      Briand, Emmanuel; Orellana, Rosa; Rosas Celis, Mercedes Helena (Cornell University, 2008)
      We show that the Kronecker coefficients indexed by two two–row shapes are given by quadratic quasipolynomial formulas whose domains are the maximal cells of a fan. Simple calculations provide explicitly the quasipolynomial ...
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      Rammed Earth Construction: A Proposal for a Statistical Quality Control in the Execution Process  [Article]

      Canivell, Jacinto; Martín del Río, Juan Jesús; Falcón Ganfornina, Raúl Manuel; Rubio Bellido, Carlos (MDPI AG, 2020)
      Unlike other common contemporary construction materials such as concrete, mortars, or fired clay bricks, which are widely supported by international standards and regulations, building with rammed earth is barely regulated. ...
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      Rebuilding convex sets in graphs  [Article]

      Cáceres González, José; Márquez Pérez, Alberto; Oellermann, Ortrud R.; Puertas González, María Luz (2005)
      The usual distance between pairs of vertices in a graph naturally gives rise to the notion of an interval between a pair of vertices in a graph. This in turn allows us to extend the notions of convex sets, convex hull, and ...
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      Recent advances on Tsagas-Sourlas-Santilli isotopology  [Article]

      Falcón Ganfornina, Raúl Manuel; Núñez Valdés, Juan (Kyungnam University Press, 2005)
      Because the Lie Theory solely applies to linear systems, in 1978 Santilli proposed the isotopic lifting of Lie’s theory for nonlinear systems, today known as the Lie-Santilli isotheory, via the reconstruction of linearity ...
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      Rectifications of A-Algebras  [Article]

      Real Jurado, Pedro; Jiménez Rodríguez, María José (2007)
      In this article, in the setting of connected DG-modules, we prove that, for any A -algebra M mi i≥1 , there is a chain contraction from a DG-algebra AM onto the DG-module M such that the A -algebra structure induced ...
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      Region-based segmentation of 2D and 3D images with tissue-like P systems  [Article]

      Christinal, Hepzibah A.; Díaz Pernil, Daniel; Real Jurado, Pedro (2011)
      Membrane Computing is a biologically inspired computational model. Its devices are called P systems and they perform computations by applying a finite set of rules in a synchronous, maximally parallel way. In this paper, ...
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      Removal and contraction operations in nD generalized maps for efficient homology computation  [Article]

      Damiand, Guillaume; González Díaz, Rocío; Peltier, Samuel (2014)
      In this paper, we show that contraction operations preserve the homology of nD generalized maps, under some conditions. Removal and contraction operations are used to propose an efficient algorithm that compute homology ...
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      Renormalized Solutions to a Nonlinear Parabolic-Elliptic System  [Article]

      González Montesinos, María Teresa; Ortegón Gallego, Francisco (SIAM: Society for Industrial and Applied Mathematics, 2005)
      The aim of this paper is to show the existence of renormalized solutions to a parabolicelliptic system with unbounded diffusion coefficients. This system may be regarded as a modified version of the well-known thermistor ...
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      Reporting Bichromatic Segment Intersections from Point Sets  [Article]

      Cortés Parejo, María del Carmen; Garijo Royo, Delia; Garrido Vizuete, María de los Angeles; Grima Ruiz, Clara Isabel; Márquez Pérez, Alberto; Moreno González, Auxiliadora; Valenzuela Muñoz, Jesús; Villar Liñán, María Trinidad (2012)
      In this paper, we introduce a natural variation of the problem of computing all bichromatic intersections between two sets of segments. Given two sets R and B of n points in the plane defining two sets of segments, say red ...
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      Resolving sets for Johnson and Kneser graphs  [Article]

      Bailey, Robert F.; Cáceres González, José; Garijo Royo, Delia; González Herrera, Antonio; Márquez Pérez, Alberto; Meagher, Karen; Puertas González, María Luz (2013)
      A set of vertices SS in a graph GG is a resolving set for GG if, for any two vertices u,vu,v, there exists x∈Sx∈S such that the distances d(u,x)≠d(v,x)d(u,x)≠d(v,x). In this paper, we consider the Johnson graphs J(n,k)J(n,k) ...
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      Robust mean absolute deviation problems on networks with linear vertex weights  [Article]

      López de los Mozos Martín, María Cruz; Puerto Albandoz, Justo; Rodríguez Chía, Antonio Manuel (Wiley, 2013)
      This article deals with incorporating the mean absolute deviation objective function in several robust single facility location models on networks with dynamic evolution of node weights, which are modeled by means of ...
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      Santilli autotopisms of partial groups  [Article]

      Falcón Ganfornina, Raúl Manuel; Núñez Valdés, Juan (Science Publishing Group, 2015-10)
      This paper deals with those partial groups that contain a given Santilli isotopism in their autotopism group. A classification of these autotopisms is explicitly determined for partial groups of order n ≤ 4.
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      Schedule and Cost Control in Dwelling Construction Using Control Charts  [Article]

      Marrero Meléndez, Madelyn; Fonseca, Antonio; Falcón Ganfornina, Raúl Manuel; Ramírez de Arellano Agudo, Antonio (Bentham Open, 2014)
      Methods to monitor the schedule and to control cost in dwelling construction projects are numerous and varied but commonly constitute an obstacle to a fast and agile response by construction managers, whose decisions require ...
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      Scutoids are a geometrical solution to three-dimensional packing of epithelia  [Article]

      Gómez Gálvez, Pedro; Vicente Munuera, Pablo; Tagua Jáñez, Antonio; Forja Barbosa, Cristina; Castro Rodríguez, Ana María; Letrán, Marta; Grima Ruiz, Clara Isabel; Bermúdez Gallardo, Marina; Serrano Pérez-Higueras, Óscar; Márquez Pérez, Alberto; Escudero Cuadrado, Luis María (Nature Publishing Group, 2018)
      As animals develop, tissue bending contributes to shape the organs into complex three-dimensional structures. However, the architecture and packing of curved epithelia remains largely unknown. Here we show by means of ...
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      Searching combinatorial optimality using graph-based homology information  [Article]

      Real Jurado, Pedro; Molina Abril, Helena; González Lorenzo, Aldo; Bac, Alexandra; Mari, Jean-Luc (2015)
      This paper analyses the topological information of a digital object O under a combined combinatorial-algebraic point of view. Working with a topology-preserving cellularization K(O) of the object, algebraic and combinatorial ...
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      Searching high order invariants in computer imagery  [Article]

      Berciano Alcaraz, Ainhoa; Molina Abril, Helena; Real Jurado, Pedro (2012)
      In this paper, we present a direct computational application of Homological Perturbation Theory (HPT, for short) to computer imagery. More precisely, the formulas of the A ∞–coalgebra maps Δ 2 and Δ 3 using the notion of ...
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      Sediment transport models in Shallow Water equations and numerical approach by high order finite volume methods.  [Article]

      Castro Díaz, Manuel Jesús; Fernández Nieto, Enrique Domingo; Ferreiro Ferreiro, Ana María (Elsevier, 2008)
      This paper is concerned with the numerical approximation of bedload sediment transport due to water evolution. For the hydrodynamical component we consider Shallow Water equations. The morphodynamical component is defined ...
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      Segmenting images with gradient-based edge detection using Membrane Computing  [Article]

      Díaz Pernil, Daniel; Berciano, Ainhoa; Peña Cantillana, Francisco; Gutiérrez Naranjo, Miguel Ángel (Elsevier, 2013)
      In this paper, we present a parallel implementation of a new algorithm for segmenting images with gradient-based edge detection by using techniques from Natural Computing. This bio-inspired parallel algorithm has been ...