• openAccess   Non-linear spatial modeling of rat sightings in relation to urban multi-source foci 

      Ayyad, Carlos; Mateu, Jorge; Tamayo Uria, Ibon Elsevier (2018-06)
      The brown rat has been living with humans in a wide variety of environmental contexts; it adversely affects public health by transmission of pathogens that can cause human diseases and allergies. Understanding behavioral ...
    • openAccess   Non-positive and negative at infinity divisorial valuations of Hirzebruch surfaces 

      Galindo, Carlos; Monserrat, Francisco; Moreno Ávila, Carlos Jesús Springer Verlag (2020-05)
      We consider rational surfaces Z defined by divisorial valuations ν of Hirzebruch surfaces. We introduce concepts of non-positivity and negativity at infinity for these valuations and prove that these concepts admit nice ...
    • openAccess   Non-stationary spatio-temporal point process modeling for high-resolution COVID-19 data 

      Dong, Zheng; Zhu, Shixiang; Xie, Yao; Mateu, Jorge; Rodríguez-Cortés, Francisco Javier Royal Statistical Society (2023-03-28)
      Most COVID-19 studies commonly report figures of the overall infection at a state- or county-level. This aggregation tends to miss out on fine details of virus propagation. In this paper, we analyze a high-resolution ...
    • openAccess   Nondiscrete P-Groups can be reflexive 

      Galindo, Jorge; Recoder Núñez, Luis; Tkachenko, Mikhail (2010-02)
      We present a series of examples of nondiscrete reflexive P-groups (i.e., groups in which all G -sets are open) as well as noncompact reflexive !-bounded groups (in which the closure of every countable set is compact). ...
    • closedAccess   Nondiscrete P-groups can be reflexive 

      Galindo, Jorge; Recoder Núñez, Luis; Tkachenko, Mikhail Elsevier (2011-02-01)
      We present the first examples of nondiscrete reflexive P-groups (topological groups in which countable intersections of open sets are open) as well as of noncompact reflexive ω-bounded groups (precompact groups in which ...
    • openAccess   Nonlinear diameter preserving maps on function spaces 

      Font, Juan J.; Hosseini, Maliheh Taylor & Francis (2020-01-01)
      In this paper we study nonlinear diameter preserving mappings defined between function spaces and obtain generalizations of, basically, all known results concerning diameter preservers. In particular, we give a complete ...
    • openAccess   Nonmeasurable subgroups of compact groups 

      Hernández, Salvador; Hofmann, Karl Heinrich; Morris, Sidney A. Walter de Gruyter GmbH (2015-10)
      In 1985 S. Saeki and K. Stromberg published the following question: Does every infinite compact group have a subgroup which is not Haar measurable? An affirmative answer is given for all compact groups with the exception ...
    • openAccess   Nonparametric testing of the dependence structure among points-marks-covariates in spatial point patterns 

      Mateu, Jorge; Mrkvicka, Tomas; Dvořák, Jiří; González, Jonatan A. John Wiley & Sons (2022-05-16)
      We investigate testing of the hypothesis of independence between a covariate and the marks in amarked point process. It would be rather straightforward if the (unmarked) point process wereindependent of the covariate and ...
    • closedAccess   Nonparametric tilted density function estimation: A cross-validation criterion 

      Doosti, Hassan; Hall, Peter; Mateu, Jorge Elsevier (2018-12)
      In this paper, we propose a tilted estimator for nonparametric estimation of a density function. We use a cross-validation criterion to choose both the bandwidth and the tilted estimator parameters. We demonstrate theoretically ...
    • openAccess   Norm-additive in modulus maps between function algebras 

      Hosseini, Maliheh; Font, Juan J. Duke University Press (2014)
      The main purpose of this paper is to characterize norm-additive in modulus, not necessarily linear, maps defined between function algebras (not necessarily unital or uniformly closed). In fact, for function algebras A and ...
    • openAccess   Norm-attaining lattice homomorphisms 

      Dantas, Sheldon; Martínez Cervantes, Gonzalo; Rodríguez Abellán, José David; Rueda Zoca, Abraham EMS (European Mathematical Society) (2021-07-26)
      In this paper we study the structure of the set Hom(X,R) of all lattice homomorphisms from a Banach lattice X into R. Using the relation among lattice homomorphisms and disjoint families, we prove that the topological dual ...
    • openAccess   Norm-attaining operators which satisfy a Bollobás type theorem 

      Dantas, Sheldon; Jung, Mingu; Roldán, Óscar Springer (2021-04)
      In this paper, we are interested in studying the set A(parallel to center dot parallel to) (X, Y) of all norm-attaining operators T from X into Y satisfying the following: given epsilon > 0, there exists eta such that if ...
    • closedAccess   Normal subgroups and class sizes of elements of prime power order 

      Beltrán, Antonio; Felipe, Maria José American Mathematical Society (2012)
      If G is a finite group and N is a normal subgroup of G with two G-conjugacy class sizes of elements of prime power order, then we show that N is nilpotent.
    • closedAccess   Normal subgroups and p-regular G-class sizes. 

      Beltrán, Antonio; Akhlaghi, zeinab; Felipe, Maria José; Khatami, Maryam © 2011 Elsevier (2011-06)
      Let G be a finite p-solvable group and N be a normal subgroup of G. Suppose that the p-regular elements of N have exactly two G-conjugacy class sizes. In this paper it is shown that, if H is a p-complement of N, then either ...
    • openAccess   Numerical Integrators for the Hybrid Monte Carlo Method 

      Blanes, Sergio; Casas, Fernando; Sanz-Serna, JM Society for Industrial and Applied Mathematics (2014-05)
      We construct numerical integrators for Hamiltonian problems that may advantageously replace the standard Verlet time-stepper within Hybrid Monte Carlo and related simulations. Past attempts have often aimed at boosting the ...
    • 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 a family of rational perturbations of the doubling map 

      Canela, Jordi; Fagella, Núria; Garijo, Antonio Taylor and Francis (2015-06-17)
      The goal of this paper is to investigate the parameter plane of a rational family of perturbations of the doubling map given by the Blaschke products Ba(z) = z 3 z−a 1−az¯ . First we study the basic properties of these ...
    • openAccess   On a Linear Functional Mixed Effect Model for Spatial Data 

      Nasirzadeh, Roya; Mateu, Jorge; Soltani, Ahmad Reza Iranian Statistical Society (2019-08-29)
      This paper introduces a functional mixed effect random model to model spatial data. In this model, the spatial locations form the index set, while the contributing effects to the response variable are set as a linear ...
    • closedAccess   On a reverse Petty projection inequality for projections of convex bodies 

      Alonso Gutiérrez, David De Gruyter (2014-03)
      We prove a reverse Petty projection inequality which is satisfied by every convex body K. We also study given a convex body K estimates for the dimension k such that there exists a k-dimensional orthogonal projection of K ...
    • openAccess   On balancedness and D-Completeness of the space of Semi-lipschitz functions 

      Sanchis López, Manuel; Sánchez Álvarez, J. M.; Romaguera, S. Springer Verlag (2008)
      Let (X, d) be a quasi-metric space and (Y, q) be a quasi-normed linear space. We show that the normed cone of semi-Lipschitz functions from (X, d) to (Y, q) that vanish at a point x0 E X, is balanced. Moreover, it is ...