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Mostrando ítems 96-115 de 119

    • openAccess   [S]-linear and convex structures in function families 

      Bernal González, Luis; Conejero, J. Alberto; murillo arcila, marina; Seoane-Sepúlveda, J. B. Elsevier (2019)
      In this paper, the notion of [S]-lineability (originally coined by Vladimir I. Gurariy) is introduced and developed in a general abstract setting. This new notion is, then, applied to specific situations, as for instance, ...

    • openAccess   Sampling Almost Periodic and Related Functions 

      Ferri, Stefano; Galindo, Jorge; Gómez, Camilo Springer (2020-10)
      We consider certain finite sets of circle-valued functions defined on intervals of real numbers and estimate how large the intervals must be for the values of these functions to be uniformly distributed in an approximate ...

    • openAccess   Sensitive dependence for nonautonomous discrete dynamical systems 

      Miralles Montolío, Alejandro; murillo arcila, marina; Sanchis López, Manuel Elsevier (2018-03)
      Given a nonautonomous discrete dynamical system (NDS) we show that transitivity and density of periodic points do not imply sensitivity in general, i.e., in the definition of Devaney chaos there are no redundant conditions ...

    • openAccess   Seshadri-type constants and Newton-Okounkov bodies for non-positive at infinity valuations of Hirzebruch surfaces 

      Galindo, Carlos; Monserrat, Francisco; Moreno Ávila, Carlos Jesús Taylor and Francis (2023-02-01)
      We consider flags E• = {X ⊃ E ⊃ {q}}, where E is an exceptional divisor defining a non-positive at infinity divisorial valuation νE of a Hirzebruch surface Fδ , q a point in E and X the surface given by νE , and determine ...

    • openAccess   Sex differences in gray matter volume: how many and how large are they really? 

      Sanchis-Segura, Carla; Ibáñez Gual, Maria Victoria; Adrián-Ventura, Jesús; Aguirre, Naiara; Cruz Gómez, Álvaro Javier; Avila, Cesar; Forn, Cristina BMC (2019-07-01)
      Background: Studies assessing volumetric sex differences have provided contradictory results. Total intracranial volume (TIV) is a major confounding factor when estimating local volumes of interest (VOIs). We investigated ...

    • openAccess   Singular perturbations of Blaschke products and connectivity of Fatou components 

      Canela, Jordi American Institute of Mathematical Sciences (AIMS) (2017)
      The goal of this paper is to study the family of singular perturbations of Blaschke products given by Ba,λ(z)=z3z−a1−a¯z+λz2. We focus on the study of these rational maps for parameters a in the punctured disk D∗ and |λ| ...

    • openAccess   Smooth and Polyhedral Norms via Fundamental Biorthogonal Systems 

      Dantas, Sheldon; Hájek, Petr; Russo, Tommaso Oxford University Press (2022-08-04)
      Let X be a Banach space with a fundamental biorthogonal system, and let Y be the dense subspace spanned by the vectors of the system. We prove that Y admits a C∞-smooth norm that locally depends on finitely many coordinates ...

    • closedAccess   Spatio-temporal modeling of traffic accidents incidence on urban road networks based on an explicit network triangulation 

      Chaudhuri, Somnath; Juan, Pablo; Mateu, Jorge Taylor and Francis Group (2022-07-29)
      Traffic deaths and injuries are one of the major global public health concerns. The present study considers accident records in an urban environment to explore and analyze spatial and temporal in the incidence of road ...

    • openAccess   Splitting and composition methods in the numerical integration of differential equations 

      Blanes, Sergio; Murua, Ander; Casas, Fernando Sociedad Española de Matemática Aplicada (2008)
      We provide a comprehensive survey of splitting and composition methods for the numerical integration of ordinary differential equations (ODEs). Splitting methods constitute an appropriate choice when the vector field ...

    • openAccess   Splitting and composition methods with embedded error estimators 

      Blanes, Sergio; Casas, Fernando; Thalhammer, Mechthild Elsevier (2019-12)
      We propose new local error estimators for splitting and composition methods. They are based on the construction of lower order schemes obtained at each step as a linear combination of the intermediate stages of the integrator, ...

    • openAccess   Stabilizer quantum codes defined by trace-depending polynomials 

      Galindo, Carlos; Hernando, Fernando; Martín-Cruz, Helena; Ruano, Diego Elsevier (2022-12-29)
      Quantum error-correcting codes with good parameters can be constructed by evaluating polynomials at the roots of the polynomial trace [18]. In this paper, we propose to evaluate polynomials at the roots of trace-depending ...

    • openAccess   Symplectic propagators for the Kepler problem with time-dependent mass 

      Bader, Philipp; Blanes, Sergio; Casas, Fernando; Kopylov, Nikita Springer (2019-06)
      New numerical integrators specifically designed for solving the two-body gravitational problem with a time-varying mass are presented. They can be seen as a generalization of commutator-free quasi-Magnus exponential ...

    • 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 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 Lie-group method based on radial basis functions for solving nonlinear high dimensional generalized Benjamin–Bona–Mahony–Burgers equation in arbitrary domains 

      Hajiketabi, Mohammad; Abbasbandy, Saeid; Casas, Fernando Elsevier (2018-03-15)
      The aim of this paper is to introduce a new numerical method for solving the nonlinear generalized Benjamin–Bona–Mahony–Burgers (GBBMB) equation. This method is combination of group preserving scheme (GPS) with radial basis ...

    • openAccess   The Lyrids meteor shower: A historical perspective 

      Martínez Usó, María José; Marco Castillo, Francisco José; López Ortí, José Antonio Elsevier Science Direct (2023-10-26)
      The April Lyrid meteor shower is the oldest meteor shower ever recorded continuously throughout history, dating as far back as 687 BC. Before the 20th century, historical sources only provided reports of two years of strong ...

    • openAccess   The Universal Zeta Function for Curve Singularities and its Relation with Global Zeta Functions 

      Moyano-Fernández, Julio José Springer (2018-11-04)
      The purpose of this note is to give a brief overview on zeta functions of curve singularities and to provide some evidences on how these and global zeta functions associated to singular algebraic curves over perfect fields ...

    • openAccess   The weak compactification of locally compact groups 

      Ferrer, María V.; Hernández, Salvador Elsevier (2021)
      We further investigate the weak topology generated by the irreducible unitary representations of a group G. A deep result due to Ernest [13] and Hughes [22] asserts that every weakly compact subset of a locally compact ...

    • openAccess   Transitivity in Fuzzy Hyperspaces 

      Jardón, Daniel; Sánchez, Iván; Sanchis, Manuel MDPI (2020)
      Given a metric space (X, d), we deal with a classical problem in the theory of hyperspaces: how some important dynamical properties (namely, weakly mixing, transitivity and point-transitivity) between a discrete dynamical ...

    • openAccess   Tutorización virtual sobre matemáticas 

      Gregori, Pablo; Martínez, Vicente UNED (2018)
      Los profesores de matemáticas, frecuentemente, encuentran problemas en la representación de símbolos para comunicarse de manera virtual con sus estudiantes. En este sentido y con el objetivo de facilitar la comunicación ...