Browsing MAT_Articles by Title
-
R-factorizable paratopological groups
Elsevier (2010)For i = 1, 2, 3, 3.5, we define the class of R<sub>i</sub>-factorizable paratopological groups G by the condition that every continuous real-valued function on G can be factorized through a continuous homomorphism p : G → ... -
Radon-Nikodým derivatives for vector measures belonging to Köthe function spaces
Elsevier (2008)Let m, n be a couple of vector measures with values on a Banach space. We develop a separation argument which provides a characterization of when the Radon-Nikodým derivative of n with respect to m-in the sense of the ... -
Random non-autonomous second order linear differential equations: mean square analytic solutions and their statistical properties
Springer (2018-10-24)In this paper we study random non-autonomous second order linear differential equations by taking advantage of the powerful theory of random difference equations. The coefficients are assumed to be stochastic processes, ... -
Rational maps with Fatou components of arbitrarily large connectivity
Elsevier (2018-02-02)We study the family of singular perturbations of Blaschke products . We analyse how the connectivity of the Fatou components varies as we move continuously the parameter λ. We prove that all possible escaping configurations ... -
Real-Linear Isometries and Jointly Norm-Additive Maps on Function Algebras
Springer (2015)In this paper, we describe into real-linear isometries defined between (not necessarily unital) function algebras and show, based on an example, that this type of isometries behaves differently from surjective real-linear ... -
Real-Multilinear Isometries on Function Algebras
Springer International Publishing (2017)Let A 1 ,...,A k be function algebras (or more generally, dense subspaces of uniformly closed function algebras) on locally compact Haus- dorff spaces X 1 ,...,X k , respectively, and let Y be a locally ... -
Reality, Systems and Impure Systems
Springer (2014)Impure systems contain Objects and Subjects: Subjects are human beings. We can distinguish a person as an observer (subjectively outside the system) and that by definition is the Subject himself, and part of the system. ... -
Recent advances to model anisotropic space–time data
Springer-Verlag (2008-05)Building new and flexible classes of nonseparable spatio-temporal covariances and variograms has resulted a key point of research in the last years. The goal of this paper is to present an up-to-date overview of recent ... -
Reconstrucción cognitiva de los conceptos centrales de la función exponencial: un estudio de enfoque mixto
Centro de Informacion Tecnologica (2021)Este estudio presenta evidencias sobre la validación de un modelo cognitivo llamado descomposición genética para la reconstrucción del concepto función exponencial. Se encuesta a 22 estudiantes del profesorado de matemática ... -
Reflections in topological algebraic structures
Elsevier (2020-08)Let C be an epireflective subcategory of Top and let rC be the epireflective functor associated with C. If A denotes a (semi)topological algebraic subcategory of Top, we study when rC (A) is an epireflective subcategory ... -
Reflexivity in precompact groups and extensions
Elsevier (2014-02)We establish some general principles and find some counter-examples concerning the Pontryagin reflexivity of precompact groups and P-groups. We prove in particular that: (1) A precompact Abelian group G of ... -
Reflexivity of prodiscrete topological groups
Elsevier (2011)We study the duality properties of two rather different classes of subgroups of direct products of discrete groups (protodiscrete groups): P-groups, i.e., topological groups such that countable intersections of its open ... -
Reliability Evaluation of the Data Acquisition Potential of a Low-Cost Climatic Network for Applications in Agriculture
MDPI (2020)Temperature, humidity and precipitation have a strong influence on the generation of diseases in different crops, especially in vine. In recent years, advances in different disciplines have enabled the deployment of sensor ... -
Reliability Validation of a Low-Cost Particulate Matter IoT Sensor in Indoor and Outdoor Environments Using a Reference Sampler
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 ... -
Representation and approximation by series of continuous functions
Springer Verlag (2008)Let X be a topological space and let C (X) be the ring of all real-valued continuous functions defined on X. In this paper, we study the representation and approximation of continuous functions by sums of infinite series. ... -
Representation of group isomorphisms I
Elsevier (2019-08-15)Let G be a metric group and let Aut(G) denote the automorphism group of G. If A and B are groups of G-valued maps defined on the sets X and Y , respec- tively, we say that A and B are equivalent if there is a group ... -
Representation of Group Isomorphisms: The Compact Case
Hindawi Publishing Corporation (2015)Let 𝐺� be a discrete group and let A and B be two subgroups of 𝐺�-valued continuous functions defined on two 0-dimensional compact spaces 𝑋� and 𝑌�. A group isomorphism 𝐻� defined between A and B is called separating ... -
Resample-smoothing of Voronoi intensity estimators
Springer (2019)Voronoi estimators are non-parametric and adaptive estimators of the intensity of a point process. The intensity estimateat a given location is equal to the reciprocal of the size of the Voronoi/Dirichlet cell containing ... -
Residual kriging for functional data. Application to the spatial prediction of salinity curves
Taylor & Francis (2015)Recently several methodologies for carrying out geostatistical analysis of functional data has been proposed. All of them assume that the spatial functional process considered is stationary. However in practice we often ... -
Restrictions on maximal invariant subgroups implying solvability of finite groups
Springer Verlag (2018)Suppose that G and A are finite groups such that A acts coprimely on G via automorphisms. It is interesting to investigate the structure and properties of G when we impose some restrictions on its maximal A-invariant ...