Listar MAT_Articles por fecha de publicación
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Integration rules from the equivalent differential equation method applied to equations of motion
Elsevier (2008)The numerical integration of equations of motion necessarily implies the presence of errors that depend on initial conditions as well as the different physical parameters under consideration. More particularly, dumping or ... -
Structure of finite groups under certain arithmetical conditions on class sizes
Elsevier (2008)Let G be a finite solvable group. We assume that the set of conjugacy class sizes of G is {1, m, n, m k} with m and n coprime positive integers greater than 1 and k a divisor of n. Then we obtain several properties on the ...
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Corrigendum to "Variations on a theorem by Alan Camina on conjugacy class sizes" [J. Algebra 296 (2006) 253-266]
Elsevier (2008)[No abstract available]
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Modelling residuals dependence in dynamic life tables: A geostatistical approach
Elsevier (2008)The problem of modelling dynamic mortality tables is considered. In this context, the influence of age on data graduation needs to be properly assessed through a dynamic model, as mortality progresses over the years. After ...
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Stability numbers in K-contact manifolds
Elsevier (2008)The aim of this paper is to study the stability of the characteristic vector field of a compact K-contact manifold with respect to the energy and volume functionals when we consider on the manifold a two-parameter variation ...
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Computational tools to construct semi-analytical planetary theories
Taylor & Francis (2008)The main aim of this paper is the construction of a set of computational tools in order to improve the management of large expansions used in celestial mechanics. This package involves an iterative algorithm to develop the ...
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Totally Lindelöf and totally ω-narrow paratopological groups
Elsevier (2008-01)In many natural objects of topological algebra that possess the algebraic structure of a group, the operations of inversion and multiplication are not necessarily continuous—it suffices to recall the groups of homeomorphisms of ...
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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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On the second order properties of the multidimensional periodogram for regularly spaced data
Society for Industrial and Applied Mathematics (2009)Recently there is growing interest in improving the level of knowledge of spatial and spatio-temporal processes using spectral techniques. The properties of the estimator of the spectral density, the periodogram, have been ... -
The Magnus expansion and some of its applications
Elsevier (2009)Approximate resolution of linear systems of differential equations with varying coefficients is a recurrent problem, shared by a number of scientific and engineering areas, ranging from Quantum Mechanics to Control Theory. ...
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Comparison theory of Lorentzian distance with applications to spacelike hypersurfaces
American Institute of Physics (2009)In this paper we summarize some comparison results for the Lorentzian distance function in spacetimes, with applications to the study of the geometric analysis of the Lorentzian distance on spacelike hypersurfaces. In ...
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p-Capacity and p-hyperbolicity of submanifolds
Universidad Autónoma de Madrid. Departamento de Matemáticas (2009)We use explicit solutions to a drifted Laplace equation in warped product model spaces as comparison constructions to show $p$-hyperbolicity of a large class of submanifolds for p>2. The condition for $p$-hyperbolicity is ...
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The structure of finite groups with three class sizes
Walter de Gruyter (2009)Let G be a finite group and suppose that the set of conjugacy class sizes of G is f1; m; mng, where m; n > 1 are coprime. We prove that m 1⁄4 p for some prime p dividing n 1. We also show that G has an abelian normal ...
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Quantifying Uncertainties for Prostate Image-Guided Radiotherapy: A 3D Organ Reconstruction and Registration Method
Bentham Science Publishers (2009)The purpose of this paper is to present a method for volumetric reconstruction, registration and margin assignation applicable to both conventional CT scans and on board CT imaging. This method does not depend on the shape ...
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Torsional rigidity of submanifolds with controlled geometry
Springer Verlag (2009)We prove explicit upper and lower bounds for the torsional rigidity of extrinsic domains of submanifolds Pm with controlled radial mean curvature in ambient Riemannian manifolds Nn with a pole p and with sectional ...
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On unitary representability of topological groups
Springer Verlag (2009)We prove that the additive group (E*, τ k (E)) of an -Banach space E, with the topology τ k (E) of uniform convergence on compact subsets of E, is topologically isomorphic to a subgroup of the unitary group of some Hilbert ...
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Archimedean spectral densities for nonstationary space-time
Academia Sinica. Institute of Statistical Science (2009)In this work we investigate methods for modelling space-time nonstationary data. We combine the approaches based on spatial adapting and spectral tempering of spectral densities with the desirable features of Archimedean ...
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An application of modified equation to reduce some numerical instabilities
American Institute of Physics (2009)The presence of errors in the initial conditions and the different physical parameters affect to numerical integration of equations of motion necessarily. It is interesting to determine which the causes of the possible ...
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Self-duality in the class of precompact groups
Elsevier (2009)A topological Abelian group G is called (strongly) self-dual if there exists a topological isomorphism Φ : G → G<sup>∧</sup> of G onto the dual group G<sup>∧</sup> (such that Φ (x) (y) = Φ (y) (x) for all x, y ∈ G). We ...
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A new expression for the density of totally geodesic submanifolds in space forms, with stereological applications
Elsevier (2009)Integral section formulae for totally geodesic submanifolds (planes) intersecting a compact submanifold in a space form are available from appropriate representations of the motion invariant density (measure) of these ...
