Results 31 to 40 of about 569,781 (362)

The Systematic Risk at the Crisis—A Multifractal Non-Uniform Wavelet Systematic Risk Estimation

Fractal and Fractional, 2021
In the last decade, many factors, such as socio-political and econo-environmental ones, have led to a perturbation in the timeline of the worldwide development, and especially in countries and regions having political changes.
Mounir Sarraj, Anouar Ben Mabrouk
doaj   +1 more source

The Largest Subsemilattices of the Endomorphism Monoid of an Independence Algebra [PDF]

, 2014
An algebra $\A$ is said to be an independence algebra if it is a matroid algebra and every map $\al:X\to A$, defined on a basis $X$ of $\A$, can be extended to an endomorphism of $\A$.
Araújo, João, Bentz, Wolfram, Konieczny, Janusz   +2 more
core   +2 more sources

Two dimensional general covariance from three dimensions [PDF]

, 1993
A 3d generally covariant field theory having some unusual properties is described. The theory has a degenerate 3-metric which effectively makes it a 2d field theory in disguise.
Arnowitt A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Balachandran A P, Carlip S, Deser S, Giddings S, Ginsparg P, Horowitz G T, Husain V, Husain V, Husain V, Kuchar K V, Regge T, Rovelli C, Ryan M, Smolin L, V Husain, Witten E   +20 more
core   +3 more sources

Wavelet-based systematic risk estimation for GCC stock markets and impact of the embargo on the Qatar case

Quantitative Finance and Economics, 2023
Systematic risk is one of the well-known indices involved in the market situation study. One of the disadvantages of scientific studies of market indices is the lack of involving extreme changes such as embargos and other crises in the model. The present
Anouar Ben Mabrouk, Sabrine Arfaoui, Mohamed Essaied Hamrita   +2 more
doaj   +1 more source

Hall Current Effect of Magnetic-Optical-Elastic-Thermal-Diffusive Non-Local Semiconductor Model during Electrons-Holes Excitation Processes

Crystals, 2022
This paper investigates a theoretical model for the interaction between electrons and holes (E/H) in elastic non-local semiconductors. When the medium is activated by photo-energy because of high temperatures, an optical-elastic-thermal-diffusion (OETD ...
Riadh Chteoui, Khaled Lotfy, Alaa A. El-Bary, Mohamed M. Allan   +3 more
doaj   +1 more source

Universal arrows to forgetful functors from categories of topological algebra [PDF]

, 1992
We survey the present trends in theory of universal arrows to forgetful functors from various categories of topological algebra and functional analysis to categories of topology and topological algebra.
Pestov, Vladimir G.
core   +2 more sources

Wrońskian algebra and Broadhurst–Roberts quadratic relations [PDF]

Communications in Number Theory and Physics, 2020
Through algebraic manipulations on Wronskian matrices whose entries are reducible to Bessel moments, we present a new analytic proof of the quadratic relations conjectured by Broadhurst and Roberts, along with some generalizations.
Yajun Zhou
semanticscholar   +1 more source

Quantum solutions of a nonlinear Schrödinger equation [PDF]

Iranian Journal of Numerical Analysis and Optimization
In the present paper, we precisely conduct a quantum calculus method for the numerical solutions of PDEs. A nonlinear Schrödinger equation is considered. Instead of the known classical discretization methods based on the finite difference scheme, Adomian
S. Arfaoui, Ben Mabrouk
doaj   +1 more source

Moore–Gibson–Thompson Stability Model in a Two-Temperature Photonic Semiconductor Excited Medium Affected by Rotation and Initial Stress

Crystals, 2022
In this paper, the two-temperature theory is used to examine a novel model that generalizes the Moore–Gibson–Thompson (MGT) effect according to two-dimensional electronic/thermoelastic deformation.
Riadh Chteoui, Kh. Lotfy, M. A. Seddeek, A. El-Dali, W. S. Hassanin   +4 more
doaj   +1 more source

Primary decompositions of unital locally matrix algebras [PDF]

Bulletin of Mathematical Sciences, 2020
We construct a unital locally matrix algebra of uncountable dimension that (1) does not admit a primary decomposition, (2) has an infinite locally finite Steinitz number. It gives negative answers to questions from [V. M.
Oksana Bezushchak, Bogdana Oliynyk
doaj   +1 more source