Results 51 to 60 of about 482 (176)
Electronic Journal of Qualitative Theory of Differential EquationsIn this work, we give a variation of parameters formula for nonautonomous linear impulsive differential equations with piecewise constant arguments of generalized type. We cover several cases of differential equations with deviated arguments investigated
Ricardo Torres, Manuel Pinto
doaj +1 more source
Self‐improving property for certain degenerate functionals with generalized Orlicz growth
Bulletin of the London Mathematical Society, Volume 58, Issue 8, August 2026.Abstract We investigate a self‐improving property of variational integrals in a weighted framework under generalized Orlicz growth conditions. Assuming that the weight belongs to an appropriate Muckenhoupt class and the growth function satisfies standard structural conditions, we prove that the gradient of any local quasi‐minimizer has local higher ...
Vertti Hietanen, Mikyoung Lee
wiley +1 more source
Limiting Differential Inclusions and the Method of Lyapunov’s Functions
Известия Иркутского государственного университета: Серия "Математика", 2015 In article the method of research of asymptotic behaviour for solutions of the nonautonomous systems submitted in the form of differential inclusions develops.
I.A. Finogenko
doaj
Ecological Applications, Volume 36, Issue 5, July 2026.Abstract Biological invasions threaten biodiversity, economic stability, and public health, exacerbated by intensive global trade and transport. The economic costs of these invasions have exceeded US$2 trillion globally and continue to increase. Although past invasion costs have been described across various contexts, there are few robust projections ...
Danish A. Ahmed +11 more
wiley +1 more source
The choice argument for proportional representation
American Journal of Political Science, Volume 70, Issue 3, Page 912-924, July 2026.Abstract What electoral system should a democracy choose? I argue for proportional representation (PR). My main empirical premise is Duverger's law: Under PR there are more viable candidates in district‐level elections than there are under single‐member plurality (SMP) systems.
Adam Lovett
wiley +1 more source
Monotone solutions of a nonautonomous differential equation for a sedimenting sphere
Electronic Journal of Differential Equations, 2001 We study a class of integrodifferential equations and related ordinary differential equations for the initial value problem of a rigid sphere falling through an infinite fluid medium.
Andrew Belmonte +2 more
doaj
The Bohl spectrum for nonautonomous differential equations
, 2015 We develop the Bohl spectrum for nonautonomous linear differential equation on a half line, which is a spectral concept that lies between the Lyapunov and the Sacker--Sell spectrum. We prove that the Bohl spectrum is given by the union of finitely many intervals, and we show by means of an explicit example that the Bohl spectrum does not coincide with ...
Doan, TS, Palmer, KJ, Rasmussen, M
openaire +3 more sources
On the Proper Treatment of Dynamics in Cognitive Science
Topics in Cognitive Science, Volume 18, Issue 3, July 2026.Abstract This essay examines the relevance of dynamical ideas for cognitive science. On its own, the mere mathematical idea of a dynamical system is too weak to serve as a scientific theory of anything, and dynamical approaches within cognitive science are too rich and varied to be subsumed under a single “dynamical hypothesis.” Instead, after first ...
Randall D. Beer
wiley +1 more source
Sharp forced waves of degenerate diffusion equations in shifting environments
Advances in Nonlinear AnalysisThis article is concerned with the sharp forced waves for degenerate diffusion equations in a shifting environment. The degeneracy of diffusion usually causes the forced waves to become sharp.
Mei Ming +4 more
doaj +1 more source
Dynamics of a Nonautonomous Stochastic SIS Epidemic Model with Double Epidemic Hypothesis
Complexity, 2017 We investigate the dynamics of a nonautonomous stochastic SIS epidemic model with nonlinear incidence rate and double epidemic hypothesis. By constructing suitable stochastic Lyapunov functions and using Has’minskii theory, we prove that there exists at ...
Haokun Qi, Lidan Liu, Xinzhu Meng
doaj +1 more source