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Mostrando ítems 11-20 de 29
Artículo
Asymptotics of Keiper-Li coefficients
(Adam Mickiewicz University, Faculty of Mathematics and Computer Science, 2011)
We show that the Riemann Hypothesis is equivalent to the assertion (ym)∈ℓ2 where ymym is defined by λm=1/2(logm+γ−log(2π)−1)+ym, and mλm represents the numbers in Xian-Jin Li's criterion. This confirms and further sharpens ...
Tesis Doctoral
Propiedad de punto fijo, normas equivalentes y espacios de funciones no- conmutativos
(2011-11-24)
Sean C un conjunto y ... color: black; font-size: 11.5pt">T : C → C un operador. Decimos que T tiene un punto fjo si existe x ∈ C tal que Tx = x. Algunas propiedades acerca del operador T y el dominio C pueden asegurar la ...
Tesis Doctoral
Estudio de algunos aspectos geométricos de los espacios métricos geodésicos y sus consecuencias en la teoría métrica del punto fijo
(2011)
El primer capítulo de este trabajo es de carácter preliminar y en él se reúnen fundamentalmente los conceptos más elementales y, en su mayoría, no originales que hemos estimado necesarios para una adecuada lectura y ...
Artículo
Artículo
A note on the invariant distribution of a quasi-birth-and-death process
(Institute of Physics, 2011)
The aim of this paper is to give an explicit formula of the invariant distribution of a quasi-birth-and-death process in terms of the block entries of the transition probability matrix using a matrix-valued orthogonal ...
Artículo
Ratchet effect on a relativistic particle driven by external forces
(Institute of Physics, 2011)
We study the ratchet effect of a damped relativistic particle driven by both asymmetric temporal bi-harmonic and time-periodic piecewise constant forces. This system can be formally solved for any external force, providing ...
Artículo
Fixed points, selections and common fixed points for nonexpansive-type mappings
(Elsevier, 2011-10-15)
We study the existence of fixed points in the context of uniformly convex geodesic metric spaces, hyperconvex spaces and Banach spaces for single and multivalued mappings satisfying conditions that generalize the concept ...
Artículo
Essential norm of composition operators on Banach spaces of Hölder functions
(2011)
Let (X, d) be a pointed compact metric space, let 0 < α < 1, and let ϕ : X → X be a base point-preserving Lipschitz map. We show that the essential norm of the composition operator Cϕ induced by the symbol ϕ on the ...
Artículo
Turning waves and breakdown for incompressible flows
(National Academy of Sciences, 2011-03-22)
We consider the evolution of an interface generated between two immiscible, incompressible, and irrotational fluids. Specifically we study the Muskat and water wave problems. We show that starting with a family of initial ...
Artículo