Results 71 to 80 of about 25,343,404 (305)
An approach to nonstandard quantum mechanics
, 2006 We use nonstandard analysis to formulate quantum mechanics in hyperfinite-dimensional spaces. Self-adjoint operators on hyperfinite-dimensional spaces have complete eigensets, and bound states and continuum states of a Hamiltonian can thus be treated on ...
A. Raab +2 more
core +1 more source
American Journal of Community Psychology, EarlyView.Abstract Health inequalities persist along lines of income and wealth, shaped by unequal access to healthcare, differences in health behaviors, and pre‐existing chronic conditions. The COVID‐19 pandemic further put families in Korea under health strain and worsened their health outcomes.
Jaehyun Nam +3 more
wiley +1 more source
Internal set theory: A new approach to nonstandard analysis
, 1977 1. Internal set theory. We present here a new approach to Abraham Robinson's nonstandard analysis [10] with the aim of making these powerful methods readily available to the working mathematician.
Edward Nelson
semanticscholar +1 more source
Australian Journal of Social Issues, EarlyView.ABSTRACT Over almost two decades, young people's employment opportunities have been significantly impacted by events like the Global Financial Crisis (2008–2009) and the COVID‐19 pandemic (2020‐). Thus, underemployment has become a more pervasive and persistent feature of young people's labour market experiences. This research focuses on three forms of
Brendan Churchill
wiley +1 more source
A novel mouse model simulating C5 palsy after cervical surgery
Animal Models and Experimental Medicine, EarlyView.This study establishes a reliable mouse model of permanent C5 palsy (post‐laminectomy complication) via dorsal approach, selectively severing the C5 anterior nerve root while preserving the posterior root through partial C4 and C5 laminectomy. The model successfully replicates clinical C5P features—flaccid shoulder paralysis, electrophysiological ...
Chenpei Xu +8 more
wiley +1 more source
Advances in Difference Equations, 2020 The current effort is devoted to investigating and exploring the stochastic nonlinear mathematical pandemic model to describe the dynamics of the novel coronavirus.
Wasfi Shatanawi +5 more
doaj +1 more source
Analysis and Nonstandard Numerical Design of a Discrete Three-Dimensional Hepatitis B Epidemic Model
, 2019 In this work, we numerically investigate a three-dimensional nonlinear reaction-diffusion susceptible-infected-recovered hepatitis B epidemic model. To that end, the stability and bifurcation analyses of the mathematical model are rigorously discussed ...
J. Macías-Díaz, N. Ahmed, M. Rafiq
semanticscholar +1 more source
Time averaging for ordinary differential equations and retarded functional differential equations
Electronic Journal of Differential Equations, 2010 We prove averaging theorems for non-autonomous ordinary differential equations and retarded functional differential equations in the case where the vector fields are continuous in the spatial variable uniformly with respect to the time and the ...
Mustapha Lakrib, Tewfik Sari
doaj
Calculus using proximities: a mathematical approach in which students can actually prove theorems
Open Mathematics, 2017 Teaching and learning calculus are notoriously difficult and the didactic solutions may involve resorting to intuitive but vague definitions or informal gestures offered as proofs.
O’Donovan Richard
doaj +1 more source
On Some Types of Functions in Nonstandard Analysis
Science Journal of University of Zakho, 2016 In this paper, by using some nonstandard concepts given by Robinson and axiomatized by Nelson we study the behavior of functions defined on a discrete intervals, whose points are of infinitesimal distances.
Ibrahim O. Hamad, Sebar H. Jumha
doaj