Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics: Recent submissions
Now showing items 81-100 of 1633
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Item count technique with no floor and ceiling effects
(2020)Conclusions of sample surveys dealing with matters of privacy are often disputed. Many people either refuse to participate or provide false answers. Indirect questioning techniques are designed so that reliable estimates ...
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Green’s functions, Biot-Savart operators, and linking numbers on negatively curved symmetric spaces
(2019)We construct radial fundamental solutions for the differential form Laplacian on negatively curved symmetric spaces. At least, one of these Green’s functions also yields a Biot-Savart operator, i.e., a right inverse of the ...
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Testing independence for multivariate time series via the auto-distance correlation matrix
(2018)SUMMARY. We introduce the matrix multivariate auto-distance covariance and correlation functions for time series, discuss their interpretation and develop cons
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Effect of resveratrol on non-alcoholic fatty liver disease
(2019)The aim of the present study was to investigate the effect of a micronized formulation of trans-resveratrol in humans with non-alcoholic fatty liver disease (NAFLD). Trans-Resveratrol has been used in the form of micronized ...
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On categorical time series models with covariates
(2019)We study the problem of stationarity and ergodicity for autoregressive multinomial logistic time series models which possibly include a latent process and are defined by a GARCH-type recursive equation. We improve considerably ...
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An Updated Literature Review of Distance Correlation and Its Applications to Time Series
(2019)The concept of distance covariance/correlation was introduced recently to characterise dependence among vectors of random variables. We review some statistical aspects of distance covariance/correlation function, and we ...
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Empirical Likelihood Methods in Biomedicine and Health, Albert Vexler and Jihnhee Yu. Review
(2019)
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Conference Object
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A support theorem for the X-ray transform on manifolds with plane covers
(2019)This paper is concerned with support theorems of the X-ray transform on non-compact manifolds with conjugate points. In particular, we prove that all simply connected 2-step nilpotent Lie groups have a support theorem. ...
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On embedding certain Kazhdan–Lusztig cells of $$S_n$$Sninto cells of $$S_{n+1}$$Sn+1
(2018)In this paper, we consider a particular class of Kazhdan–Lusztig cells in the symmetric group $$S_n$$Sn, the cells containing involutions associated with compositions $$\lambda $$λof n. For certain families of compositions ...
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Analyticity of the attractors of dissipative-dispersive systems in higher dimensions
(2018)We investigate the analyticity of the attractors of a class of Kuramoto-Sivashinsky–type pseudodifferential equations in higher dimensions, which are periodic in all spatial variables and possess a universal attractor. ...
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On Degenerations of Algebras over an Arbitrary Field
(2019)We investigate degenerations of $n$-dimensional algebras over an arbitrary infinite field paying particular attention to algebras satisfying the identity $[x,x]=0$ (where $[x_1,x_2]$ denotes the product of the elements ...
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Describing certain Lie algebra orbits via polynomial equations
(2019)Let $\mathfrak{h}_3$ be the Heisenberg algebra and let $\mathfrak g$ be the 3-dimensional Lie algebra having $[e_1,e_2]=e_1\,(=-[e_2,e_1])$ as its only non-zero commutation relations. We describe the closure of the orbit ...
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On C-Bases, Partition Pairs and Filtrations for Induced or Restricted Specht Modules
(2019)We obtain alternative explicit Specht filtrations for the induced and the restricted Specht modules in the Hecke algebra of the symmetric group (defined over the ring A = ℤ[q1/2, q−1/2], where q is an indeterminate) using ...
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On a sequence of higher-order nonlinear diffusion-convection equations
(2019)Motivated by the existence of the thin film equations, fourth and sixth order, which are generalizations of the diffusion equation, we consider a sequence of higher order nonlinear diffusion-convection equations. We ...
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Lie symmetry analysis of a variable coefficient Calogero–Degasperis equation
(2018)We consider a general class of variable coefficient Calogero–Degasperis equations. The complete Lie group classification is performed with the aid of the appropriate equivalence group. Lie symmetries are used to derive a ...
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Lie symmetries of a system arising in plasma physics
(2018)Lie group classification for a diffusion-type system that has applications in plasma physics is derived. The classification depends on the values of 5 parameters that appear in the system. Similarity reductions are presented. ...
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Lie symmetry analysis of Burgers-type systems
(2018)Lie group classification for 2 Burgers-type systems is obtained. Systems contain 2 arbitrary elements that depend on the 2 dependent variables. Equivalence transformations for the systems are derived. Examples of nonclassical ...
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Numerical similarity solution for a variable coefficient K(m, n) equation
(2018)A technique for finding numerical similarity solutions to an initial boundary value problem (IBVP) for generalized K(m, n) equations is described. The equation under consideration is nonlinear and has variable coefficients. ...