Browsing MAT_Articles by Title

Now showing items 696-715 of 766

    • closedAccess   Taking a look into the orbit of mammalian carnivorans 

      Casares‐Hidalgo, Carlos; Pérez-Ramos, Alejandro; Forner Gumbau, Manuel; Pastor, Francisco J.; Figueirido Castillo, Francisco Borja Wiley (2019-03)
      In this study, we explore the relationship between orbit anatomy and different ecological factors in carnivorous mammals from a phylogenetic perspective. We calculated the frontation (α), convergence (β), and orbitotemporal ...

    • openAccess   Taller de resolución de problemas no rutinarios para estudiantes de 8 a 9 años: un estudio de caso 

      Rodríguez Jara, Miguel Alejandro; Vergara Gómez, Andrea Stephanie; Mondaca Saavedra, Alejandra; Gregori, Pablo Universidad Nacional de Costa Rica (2023-09-01)
      [Objetivo] Caracterizar las heurísticas utilizadas por estudiantes de entre 8 y 9 años, al enfrentar cuatro problemas no rutinarios que promueven el desarrollo del pensamiento aritmético desde dos perspectivas: la ...

    • openAccess   Ten Simple Rules for organizing a non–real-time web conference 

      Arnal, A.; Epifanio, Irene; Gregori, Pablo; Martínez, Vicente Scott Markel, Dassault Systemes BIOVIA (USA) (2020-01-26)
      The present work describes the 100% virtual ATIDES (Avances en Tecnologı ´as, Innovacio ´n y Desafı ´os de la Educacio ´n Superior) conference that was held between October 15 and 31, 2018, sponsored by Universitat Jaume ...

    • openAccess   Tensor products of topological abelian groups and Pontryagin duality 

      Ferrer, María V.; HERNÁNDEZ ARZUSA, JULIO CÉSAR; Hernandez, Salvador Elsevier (2024-02-14)
      Let G be the group of all Z-valued homomorphisms of the Baer-Specker group ZN. The group G is algebraically isomorphic to Z(N), the infinite direct sum of the group of integers, and equipped with the topology of pointwise ...

    • closedAccess   Testing first-order spherical symmetry of spatial point processes 

      Zhang, Tonglin; Mateu, Jorge Institute of Statistical Science, Academia Sinica & International Chinese Statistical Association (2020)
      This study proposes a Kolmogorov-Smirnov-type test to assess the spherical symmetry of the first-order intensity function of a spatial point process (SPP). Spherical symmetry, which is an important assumption in the well ...

    • closedAccess   Testing for local structure in spatiotemporal point pattern data 

      Siino, Marianna; Rodríguez-Cortés, Francisco Javier; Mateu, Jorge; adelfio, giada Wiley (2017-09-03)
      The detection of clustering structure in a point pattern is one of themain focuses of attention in spatiotemporal data mining. Indeed, statistical tools for clustering detection and identification of individual events ...

    • openAccess   Testing similarity between first-order intensities of spatial point processes. A comparative study 

      Mateu, Jorge Taylor & Francis (2023)
      Testing whether two spatial point processes have the same spatial distribution is an important task that can be addressed from different perspectives. A Kolmogorov-Smirnov test with asymptotic calibration and a Cramer von ...

    • openAccess   The Abhyankar-Moh Theorem for plane valuations at infinity 

      Galindo, Carlos; Monserrat, Francisco Elsevier (2013)
      We introduce the class of plane valuations at infinity and prove an analogue to the Abhyankar–Moh (semigroup) Theorem for it.

    • openAccess   The behavior of Stanley depth under polarization 

      Ichim, Bogdan; Katthän, Lukas; Moyano-Fernández, Julio José Elsevier (2015-10)
      Let K be a field, R = K [ X 1 , ..., X n ]be the polynomial ring and J I be two monomial ideals in R . In this paper we show that sdepth I/J − depth I/J = sdepth I p /J p − ...

    • openAccess   The Bishop-Phelps-Bollobás properties in complex Hilbert space 

      Choi, Yun Sung; Dantas, Sheldon; Jung, Mingu Wiley (2021-12-02)
      In this paper, we consider theBishop–Phelps–Bollobás point propertyfor variousclasses of operators on complex Hilbert spaces, which is a stronger property thanthe Bishop–Phelps–Bollobás property. We also deal with analogous ...

    • openAccess   The Bohr topology of discrete non abelian groups 

      Hernández, Salvador Heldermann Verlag (2008)
      We look at finitely generated Bohr groups G# (groups G equipped with the topology inherited from their Bohr compactification bG). Among others, the following results are proved: every finitely generated group without free ...

    • openAccess   The character of topological groups, via Pontryagin-van Kampen duality 

      Chis, Cristina; Ferrer González, María Vicenta; Hernández, Salvador; Tsaban, Boaz (2011-06)
      The Birkhoff-Kakutani Theorem asserts that a topological group is metrizable if and only if it has countable character. We develop and apply tools for the estimation of the character for a wide class of nonmetrizable ...

    • openAccess   The cone of curves and the Cox ring of rational surfaces given by divisorial valuations 

      Galindo, Carlos; Monserrat, Francisco Elsevier (2016-02)
      We consider surfaces X defined by plane divisorial valuations ν of the quo- tient field of the local ring R at a closed point p of the projective plane P 2 over an arbitrary algebraically closed field k and ...

    • openAccess   The Constant of Interpolation in Bloch Type Spaces 

      Miralles, Alejandro; Maletzki, Mario P. Springer (2023-09)
      It is known that there exists a constant 0 < Δ1 < 1 such that any Δ1-separated sequence for the pseudohyperbolic distance in the open unit disk D of C is interpolating for the classical Bloch space B. We will prove that ...

    • openAccess   The curve shortening flow with density of a spherical curve in codimension two 

      VIÑADO LEREU, FRANCISCO Springer (2020-10-03)
      In the present paper we carry out a systematic study about the flow of a spherical curve by the mean curvature flow with density in a 3-dimensional rotationally symmetric space with density (M3 w, gw,ξ) where the density ...

    • closedAccess   The damped pendulum random differential equation: A comprehensive stochastic analysis via the computation of the probability density function 

      Calatayud, Julia; Cortés, Juan Carlos; Jornet, Marc Elsevier B.V. (2018-08-13)
      This paper deals with the damped pendulum random differential equation: X¨(t)+2ω0ξX˙(t) + ω 2 0 X(t) = Y(t), t ∈ [0, T ], with initial conditions X(0) = X0 and X˙(0) = X1. The forcing term Y(t) is a stochastic process ...

    • closedAccess   The dimension of subcode-subfields of shortened generalized Reed–Solomon codes 

      Hernando, Fernando; Marshall, Kyle; O'Sullivan, Michael E. Springer US (2012-03)
      Reed–Solomon (RS) codes are among the most ubiquitous codes due to their good parameters as well as efficient encoding and decoding procedures. However, RS codes suffer from having a fixed length. In many applications where ...

    • closedAccess   The driving forces behind China’s growth 

      Herrerías Talamantes, María Jesús; Orts, Vicente Wiley (2011-01)
      The main objective of this article is to disentangle the determinants of the Chinese economic growth that occurred from 1965 to 2000. We have explored, first, the time series properties of the growth rates of gross domestic ...

    • openAccess   The dual space of precompact groups 

      Ferrer González, María Vicenta; Hernández, Salvador; Uspenskij, Vladimir Faculty of Mathematics and Physics of Charles University, Prague (2013)
      For any topological group G the dual object Gb is defined as the set of equivalence classes of irreducible unitary representations of G equipped with the Fell topology. If G is compact, Gb is discrete. In an earlier paper ...

    • openAccess   The Import Effects of the Entry Price System 

      Gaetano Santeramo, Fabio; Martinez-Gomez, Victor; Márquez-Ramos, Laura; Lamonaca, Emilia Western Agricultural Economics Association (2024-01-01)
      The European fruit and vegetable (F&V) trade regime is regulated by the Entry Price System (EPS), a nontariff measure on imported goods. We investigate the trade effects of the EPS by estimating a structural gravity model ...