• openAccess   Occultation of Planets by the Moon in European Narrative Medieval Sources 

      Martínez Usó, María José; Marco Castillo, Francisco José Sage (2019-05)
      Existing research dealing with astronomical observations from medieval Europe have extensively covered topics such as solar and lunar eclipses and sightings of comets and meteors, but no compilation of occultations of ...
    • openAccess   On interpolating sequences for Bloch type spaces 

      Miralles, Alejandro; Maletzki, Mario P. Elsevier (2022-02-14)
      When we deal with , it is known that interpolating sequences are interpolating and it is sufficient to interpolate idempotents of in order to interpolate the whole . We will extend these results to the frame of interpolating ...
    • openAccess   On Multi-Index Filtrations Associated to Weierstraß Semigroups 

      Moyano-Fernández, Julio José Springer, Cham (2020-05-14)
      This paper is a survey on the main techniques involved in the computation of the Weierstraß semigroup at several points of curves defined over perfect fields, with special emphasis on the case of two points. Some hints ...
    • openAccess   On norm-attainment in (symmetric) tensor products 

      Dantas, Sheldon; García-Lirola, Luis C.; Jung, Mingu; Rueda Zoca, Abraham Taylor & Francis (2022)
      In this paper, we introduce a concept of norm-attainment in the projective symmetric tensor product of a Banach space X, which turns out to be naturally related to the classical norm-attainment of N -homogeneous polynomials ...
    • openAccess   On the Algebras VN(H) and VN(H)(*) of an Ultraspherical Hypergroup H 

      Esmailvandi , Reza; Nemati, Mehdi; Kumar, Shravan Cambridge University Press (2022-12-12)
      Let H be an ultraspherical hypergroup and let A(H) be the Fourier algebra associated with H. In this paper, we study the dual and the double dual of A(H). We prove among other things that the subspace of all ...
    • openAccess   On the basins of attraction of a one-dimensional family of root finding algorithms: from Newton to Traub 

      Canela, Jordi; Evdoridou, Vasiliki; Garijo, Antonio; Jarque, Xavier Springer (2023)
      In this paper we study the dynamics of damped Traub’s methods Tδ when applied to polynomials. The family of damped Traub’s methods consists of root finding algorithms which contain both Newton’s (δ = 0) and Traub’s method ...
    • openAccess   On the existence of non-norm-attaining operators 

      Dantas, Sheldon; Jung, Mingu; Martínez Cervantes, Gonzalo Cambridge University Press (2021-07-09)
      In this article, we provide necessary and sufficient conditions for the existence of non-norm-attaining operators in L(E,F) . By using a theorem due to Pfitzner on James boundaries, we show that if there exists a ...
    • openAccess   On the extreme non-Arens regularity of Banach algebras 

      Filali, Mahmoud; Galindo, Jorge Wiley (2021-07-04)
      As is well-known, on an Arens regular Banach algebra all continuous functionals are weakly almost periodic. In this paper, we show that 1-bases which approximate upper and lower triangles of products of elements in the ...
    • openAccess   On the generalization of the construction of quantum codes from Hermitian self-orthogonal codes 

      Galindo, Carlos; Hernando, Fernando Springer (2022-03-21)
      Many q-ary stabilizer quantum codes can be constructed from Hermitian self-orthogonal q2-ary linear codes. This result can be generalized to q2m-ary linear codes, m>1. We give a result for easily obtaining quantum codes ...
    • openAccess   On using Reproducing Kernel Hilbert Spaces for the analysis of Replicated Spatial Point Processes 

      Simó, Amelia Elsevier (2023)
      This paper focuses on the use of the theory of Reproducing Kernel Hilbert Spaces in the statistical analysis of replicated point processes. We show that spatial point processes can be observed as random variables in a ...
    • openAccess   On various types of density of numerical radius attaining operators 

      Dantas, Sheldon; Kim, Sun Kwang; Lee, Han Ju; Mazzitelli, Martin Taylor and Francis (2023)
      In this paper, we are interested in studying Bishop-Phelps-Bollob´as type properties related to the denseness of the operators which attain their numerical radius. We prove that every Banach space with a micro-transitive ...
    • openAccess   Optimal approximation to unitary quantum operators with linear optics 

      Garcia-Escartin, Juan Carlos; Gimeno, Vicent; Moyano-Fernández, Julio José Springer Nature (2021-09-21)
      Linear optical systems acting on photon number states produce many interesting evolutions, but cannot give all the allowed quantum operations on the input state. Using Toponogov’s theorem from differential geometry, we ...
    • openAccess   Order of products of elements in finite groups 

      Beltrán, Antonio; Lyons, Richard; Moretó, Alexander; Navarro, Gabriel; Sáez, Azahara; Tiep, Pham Huu Wiley (2018-10)
      If G is a finite group, p is a prime, and x∈G, it is an interesting problem to place x in a convenient small (normal) subgroup of G, assuming some knowledge of the order of the products xy, for certain p‐elements y of G.
    • openAccess   Orthogonal ℓ1-sets and extreme non-Arens regularity of preduals of von Neumann algebras 

      Filali, Mahmoud; Galindo, Jorge Elsevier (2022-03-04)
      A Banach algebra is Arens-regular when all its continuous functionals are weakly almost periodic, in symbols when ⁎ . To identify the opposite behaviour, Granirer called a Banach algebra extremely non-Arens regular ...
    • openAccess   Phase portraits of Abel quadratic differential systems of the second kind 

      Ferragut, Antoni; Valls, Claudia Taylor & Francis (2018)
      We provide normal forms and the global phase portraits on the Poincaré disk of some Abel quadratic differential equations of the second kind. Moreover, we also provide the bifurcation diagrams for these global phase portraits.
    • openAccess   Pointwise convergence topology and function spaces in fuzzy analysis 

      Jardon, Daniel R.; Sanchis López, Manuel University of Sistan and Baluchestan (2018-03)
      We study the space of all continuous fuzzy-valued functions from a space $X$ into the space of fuzzy numbers $(\mathbb{E}\sp{1},d\sb{\infty})$ endowed with the pointwise convergence topology. Our results generalize the ...
    • openAccess   Preface for the special issue “Geometric numerical integration, twenty-five years later” 

      Blanes, Sergio; Casas, Fernando Taylor and Francis (2023)
    • openAccess   QOptCraft: A Python package for the design and study of linear optical quantum systems 

      Gomez-Aguado, Daniel; Gimeno, Vicent; Moyano-Fernández, Julio José; Garcia-Escartin, Juan Carlos Elsevier (2022-08-29)
      The manipulation of the quantum states of light in linear optical systems has multiple applications in quantum optics and quantum computation. The package QOptCraft gives a collection of methods to solve some of the most ...
    • openAccess   Quasi-cyclic constructions of quantum codes 

      Galindo, Carlos; Hernando, Fernando; Matsumoto, Ryutaroh Elsevier (2018-07)
      We give sufficient conditions for self-orthogonality with respect to symplec- tic, Euclidean and Hermitian inner products of a wide family of quasi-cyclic codes of index two. We provide lower bounds for the symplectic ...
    • openAccess   Reliability Validation of a Low-Cost Particulate Matter IoT Sensor in Indoor and Outdoor Environments Using a Reference Sampler 

      Trilles, Sergio; Vicente, Ana Belen; Juan, Pablo; Ramos, Jose Francisco; Meseguer Costa, Sergio; Serra, Laura MDPI (2019)
      A suitable and quick determination of air quality allows the population to be alerted with respect to high concentrations of pollutants. Recent advances in computer science have led to the development of a high number of ...