Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title
Now showing items 1537-1556 of 1633
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Book
Transcendental elements of the Brauer group of diagonal quartic surfaces [electronic resource]
(2008)
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Doctoral Thesis
Transformation methods in the study of nonlinear partial differential equations. [electronic resource]
(University of Nottingham, 1991)
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Article
Transformation properties of a variable-coefficient Burgers equation
(2004)In this paper we consider the variable coefficient equation u t=b(t)uux+a(t)uxx which among other applications has considerable interest in nonlinear acoustics. We present transformation properties of this generalised ...
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Article
Transverse poisson structures to adjoint orbits in semisimple lie algebras
(2007)We study the transverse Poisson structure to adjoint orbits in a complex semisimple Lie algebra. The problem is first reduced to the case of nilpotent orbits. We prove then that in suitably chosen quasihomogeneous coordinates, ...
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Article
The treatment of corner and pole-type singularities in numerical conformal mapping techniques
(1986)This paper is a report of recent developments concerning the nature and the treatment of singularities that affect certain numerical conformal mapping techniques. The paper also includes some new results on the nature of ...
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Article
Treatment of harmonic mixed boundary problems by conformal transformation methods
(1972)A method consisting of three conformal transformations is used for the numerical solution of a class of harmonic mixed boundary value problems containing boundary singularities. The method, although less flexible than the ...
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Article
A tri-Hamiltonian formulation of the full Kostant-Toda lattice
(1995)We define Poisson structures which lead to a tri-Hamiltonian formulation for the full Kostant-Toda lattice. In addition, a hierarchy of vector fields called master symmetries are constructed and they are used to generate ...
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Article
Truncated poisson regression for time series of counts
(2001)We consider partial likelihood analysis of a truncated Poisson regression model for time series of counts. We focus our attention on the study of asymptotic theory for the maximum partial likelihood estimator of a vector ...
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Article
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Article
Turán type inequalities for the partial sums of the generating functions of Bernoulli and Euler numbers
(2012)Turán type inequalities for the partial sums of the generating functions of the Bernoulli and Euler numbers are established. They are shown to follow from a general result relating Turán inequalities of partial sums with ...
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Article
Turán-Type Inequalities for Some Lommel Functions of the First Kind
(2016)In this paper certain Turán-type inequalities for some Lommel functions of the first kind are deduced. The key tools in our proofs are the infinite product representation for these Lommel functions of the first kind, a ...
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Article
Two Cholesky-log-GARCH models for multivariate volatilities
(2015)Parsimonious estimation of high-dimensional covariance matrices is of fundamental importance in multivariate statistics. Typical examples occur in finance, where the instantaneous dependence among several asset returns ...
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Article
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Article
Two numerical methods for the conformal mapping of simply-connected domains
(1981)Two numerical methods are considered for the conformai mapping of a bounded simply-connected domain onto the unit disc. The two methods are respectively the Bergman kernel method, which has been described in [17], and the ...
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Article
A two-dimensional numerical study of the stick-slip extrusion instability
(2007)The time-dependent, compressible extrusion of a Carreau fluid is solved over the reservoir-die-extrudate region using finite elements in space and a fully implicit scheme in time. A nonmonotonic slip law based on experimental ...
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Article
The two-phase Stefan problem with anomalous diffusion
(Elsevier, 2022)The non-local in space two-phase Stefan problem (a prototype in phase change problems) can be formulated via a singular nonlinear parabolic integro-differential equation which admits a unique weak solution. This formulation ...
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Article
Two-phase transition problems for fully nonlinear parabolic equations of second order
(2005)In this paper we study an extension of a regularity theory presented by I. Athanasopoulos, L. Caffarelli and S. Salsa in [3], [4], to some fully nonlinear parabolic equations of second order. We investigate a two-phase ...
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Article
A two-sample model for the comparison of radiation doses
(2005)The t-test is one of the most well known parametric statistical procedures that can be applied to the problem of two-sample comparison. However, it relies on several assumptions that might not be satisfied in practice and ...
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Article
U-statistics on a lattice of I.I.D. random variables
(1998)Partial sums and sample means of r-dimensionally indexed arrays of independent random variables have been studied by Dunford (1951), Zygmund (1951), Kuelbs (1968), Wichura (1969), Smythe (1973), Gut (1978, 1992), Etemadi ...
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Article
U-statistics on associated random variables
(2004)We consider the class of U-statistics which are based on a collection of associated random variables. Since independent random variables are associated, the class of U-statistics introduced by Hoeffding (Ann. Math. Statist. ...