Listar Matemática por título
Mostrando ítems 131-150 de 232
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Obtención de conjuntos aproximados mediante algoritmos genéticos
(Tesis para optar al grado de Magister Scientiae en Computación. ITCR, Cartago, 1999., 1999)En términos generales, la teoría de conjuntos aproximados, propuesta por Pawlak, consiste en explorar las particiones asociadas a las relaciones de equivalencia generadas por cada subconjunto de los atributos observados, ... -
On asymptotic expansions of twisted products
(1989-12)The series development of the quantum-mechanical twisted product is studied. The series is shown to make sense as a moment asymptotic expansion of the integral formula for the twisted product, either pointwise or in the ... -
On summability of distributions and spectral geometry
(1998-01)Modulo the moment asymptotic expansion, the Cesàro and parametric behaviours of distributions at infinity are equivalent. On the strength of this result, we construct the asymptotic analysis for spectral densities arising ... -
On the approximation of a virtual coarse space for domain decomposition methods in two dimensions
(2018)A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ... -
On the Colmez conjecture for non-abelian CM fields
(2018-02-08)The Colmez conjecture relates the Faltings height of an abelian variety with complex multiplication by the ring of integers of a CM field E to logarithmic derivatives of Artin L-functions at s=0. In this paper, we prove ... -
On the kinematics of the last Wigner particle
(2019)Wigner's particle classification provides for "continuous spin" representations of the Poincaré group, corresponding to a class of (as yet unobserved) massless particles. Rather than building their induced realizations by ... -
On the one dimensional spectral Heat content for stable processes
(2016-09)This paper provides the second term in the small time asymptotic expansion of the spectral heat content of a rotationally invariant α-stable process, 0 < α ≤ 2, for the bounded interval (a, b). The small time behavior ... -
On the Ramanujan–Lodge harmonic number expansion
(2015-01-15)The aim of this paper is to extend and refine the Ramanujan–Lodge harmonic number expansion into negative powers of a triangular number. We construct a faster asymptotic series and some new sharp inequalities for the ... -
On the standard form of the Bloch equation
(1979-03)The requirement is often made in non-equilibrium statistical mechanics that a transport equation should be derived as that which governs the subdynamics relative to a (small) part of a (large) conservative dynamical ... -
On the supremum of a family of set functions
(2023)The concept of supremum of a family of set functions was introduced by M. Veraar and I. Yaroslavtsev (2016) for families of measures defined on a measurable space. We expand this concept to include families of set functions ... -
On the ultraviolet behaviour of quantum fields over noncommutative manifolds
(1999-03)By exploiting the relation between Fredholm modules and the Segal-Shale-Stinespring version of canonical quantization, and taking as starting point the first-quantized fields described by Connes' axioms for noncommutative ... -
Orbifolds are not commutative geometries
(2008)In this note we show that the crucial orientation condition for commutative geometries fails for the natural commutative spectral triple of an orbifold M/G. -
Parallel Sums and Adaptive BDDC Deluxe
(2017)There has recently been a considerable activity in developing adaptive methods for the selection of primal constraints for BDDC algorithms and, in particular, for BDDC deluxe variants. The primal constraints of a BDDC or ... -
Parameter estimates of the 2016-2017 Zika outbreak in Costa Rica: An Approximate Bayesian Computation (ABC) approach
(2019-03-28)In Costa Rica, the first known cases of Zika were reported in 2016. We looked at the 2016-2017 Zika outbreak and explored the transmission dynamics using weekly reported data. A nonlinear differential equation single-outbreak ... -
Parte prima a p del esquema fundamental en grupos sobre anillos de valuación discreta
(2020-11-17)Si X es un esquema propio, suave y conexo sobre Spec(R), para R un anillo de valuación discreta completo, dotado de una sección x: Spec(R) -> X, es posible construir los esquemas fundamentales en grupos pi_1(X,x) y ... -
Las partículas elementales según Wigner: aspectos clásicos y cuánticos
(2019)En 1939, Wigner clasificó las representaciones unitarias irreducibles del grupo de Poincaré; desde entonces, tales representaciones se identifican con partículas con simetría relativista. Se conocen las representaciones ... -
Phase-space representation for Galilean quantum particles of arbitrary spin
(1988-09)The phase-space approach to quantization is extended to incorporate spinning particles with Galilean symmetry. The appropriate phase space is the coadjoint orbit R^6 x S^2. From two basic principles, traciality and ... -
El problema de los subespacios invariantes
(1983-11)El Prof. Carl Pearcy, de la Universidad de Michigan en Ann Arbor, visitó la Escuela de Matemática en noviembre de 1983, y ofreció un minicurso de tres sesiones sobre el problema de los subespacios invariantes. Dicho problema ... -
Procesos de Levy Cilíndricos: Regularización e Integración
(2020)Para la presentación de los resultados de plantea una estructura de una tesis compuesta de 4 capítulos. Dichos capítulos están descritos acontinuación. En el Capítulo 1 se presentan algunos preliminares necesarios para ... -
Productos generalizados de funciones analíticas
(1990-09)Los productos generalizados son de interés en el formalismo de la mecánica cuántica en espacios de fases. En este artículo se analizan las propiedades algebraicas y topológicas de diversos productos definidos en espacios ...