Listar MAT_Articles por título
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Quantitative analysis of competition models
Elsevier (2017)We study a 2-species Lotka–Volterra type differential system, modeling competition between two species and having a coexistence equilibrium in the first quadrant. In case that this equilibrium is of saddle type, its ... -
Quantum codes from a new construction of self-orthogonal algebraic geometry codes
Springer (2020)We present new quantum codes with good parameters which are constructed from self-orthogonal algebraic geometry codes. Our method permits a wide class of curves to be used in the formation of these codes. These results ...
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Quantum codes from affine variety codes and their subfield-subcodes
Springer (2015-07)We use affine variety codes and their subfield-subcodes to obtain quantum stabilizer codes via the CSS code construction. With this procedure we get codes with good parameters, some of them exceeding the CSS quantum ...
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Quasi-arithmetic means of covariance functions with potential applications to space-time data
Elsevier (2009)The theory of quasi-arithmetic means represents a powerful tool in the study of covariance functions across space-time. In the present study we use quasi-arithmetic functionals to make inferences about the permissibility ... -
Quasi-Uniformities and Quotients of Paratopological Groups
Faculty of Sciences and Mathematics, University of Nis, Serbia (2017)For a subgroup H of a paratopological group G we prove that the quotient topology of the coset space G / H is induced by a rotund quasi-uniformity and the quotient topology of the semiregularization ( G / H ...
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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 → ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
