Results 21 to 30 of about 2,579,903 (296)

Singular value comparison of singular points and non-singular points.

open access: yes, 2020
Singular value comparison of singular points and non-singular points.
Heyu Hu (8668383)   +3 more
core   +1 more source

Singular points and Lie rotated vector fields

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2000
This paper gives the definition of Lie rotated vector fields in the plane and the conditions of movement of singular points on Lie rotated vector fields with variable parameters.
Jie Wang, Chen Chen
doaj   +1 more source

Multiple solutions of nonlinear boundary value problems with oscillatory solutions

open access: yesMathematical Modelling and Analysis, 2006
We consider two second order autonomous differential equations with critical points, which allow the detection of an exact number of solutions to the Dirichlet boundary value problem.
S. Ogorodnikova, F. Sadyrbaev
doaj   +1 more source

Violation of the Uniqueness of Solutions for the Mathematical Model of the Motion of an Aerodynamic Pendulum in the Flow of a Quasi-Static Medium

open access: yesСовременные информационные технологии и IT-образование, 2022
The article presents the construction and study of a mathematical model of small oscillations of an aerodynamic pendulum in a flow of a moving medium. The model of the impact of the medium on the body is taken as the model of the quasi-static flow around
Dmitry Belyakov
doaj   +1 more source

Methods for Determining the Size of three-Dimensional Objects in Images

open access: yesЦифровая трансформация, 2021
Computer vision technology is used to obtain the necessary information from images. The two-dimensional image was transformed into its corresponding three-dimensional structure based on the reconstruction process and singular points. A review of software
L. V. Serebryanaya, V. N. Breshko
doaj   +2 more sources

Nature of the Poynting Vector Field Singularities in Resonant Light Scattering by Nanoparticles

open access: yesNanomaterials, 2022
Singularities of the Poynting vector field subwavelength patterns in resonant light scattering by nanoparticles are discussed and classified. There are two generic types of the singularities, namely, (i) the singularities related to the vanishing of the ...
Michael I. Tribelsky   +1 more
doaj   +1 more source

Tilings in topological spaces

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1999
A tiling of a topological space X is a covering of X by sets (called tiles) which are the closures of their pairwise-disjoint interiors. Tilings of ℝ2 have received considerable attention (see [2] for a wealth of interesting examples and results as well ...
F. G. Arenas
doaj   +1 more source

Rational points on singular intersections of quadrics

open access: yes, 2013
Given an intersection of two quadrics X ⊂ ℙm-1, with m ≥ 9, the quantitative arithmetic of the set X(ℚ) is investigated under the assumption that the singular locus of consists of a pair of conjugate singular points defined over &#
Browning, T. D., Munshi, R.
core   +1 more source

Singular random matrix decompositions: distributions. [PDF]

open access: yes, 2002
Assuming that Y has a singular matrix variate elliptically contoured distribution with respect to the Hausdorff measure, the distributions of several matrices associated to QR, modified QR, SV and Polar decompositions of matrix Y are determined, for ...
González Farías, Graciela   +3 more
core   +1 more source

Identification of discrete chaotic maps with singular points

open access: yesDiscrete Dynamics in Nature and Society, 2001
We investigate the ability of artificial neural networks to reconstruct discrete chaotic maps with singular points. We use as a simple test model the Cusp map. We compare the traditional Multilayer Perceptron, the Chebyshev Neural Network and the Wavelet
P. G. Akishin   +3 more
doaj   +1 more source

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