Results 21 to 30 of about 4,336,710 (302)

Improved Hille Oscillation Criteria for Nonlinear Functional Dynamic Equations of Third-Order

open access: yesMathematics, 2022
This paper aims to improve Hille oscillation criteria for the third-order functional dynamic equation p2(ξ)ϕγ2p1ξϕγ1yΔ(ξ)ΔΔ+a(ξ)ϕγy(g(ξ))=0, on an above-unbounded time scale T. The obtained results improve related contributions reported in the literature
Taher S. Hassan   +5 more
doaj   +1 more source

Oscillation criteria for third-order functional half-linear dynamic equations

open access: yesAdvances in Difference Equations, 2017
In this paper, we study the third-order functional dynamic equation { r 2 ( t ) ϕ α 2 ( [ r 1 ( t ) ϕ α 1 ( x Δ ( t ) ) ] Δ ) } Δ + q ( t ) ϕ α ( x ( g ( t ) ) ) = 0 , $$ \bigl\{ r_{2}(t)\phi_{\alpha_{2}} \bigl( \bigl[ r_{1}(t) \phi _{\alpha _{1}} \bigl(
Taher S Hassan   +2 more
doaj   +1 more source

A dynamical study of the Friedmann equations [PDF]

open access: yesEuropean Journal of Physics, 2001
Cosmology is an attracting subject for students but usually difficult to deal with if general relativity is not known. In this article, we first recall the Newtonian derivation of the Friedmann equations which govern the dynamics of our universe and discuss the validity of such a derivation.
Uzan, Jean-Philippe, Lehoucq, Roland
openaire   +4 more sources

Forced oscillation of second-order superlinear dynamic equations on time scales

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2011
In this paper, by constructing a class of Philos type functions on time scales, we investigate the oscillation of the following second-order forced nonlinear dynamic equation $$x^{\Delta\Delta}(t)-p(t)|x(q(t))|^{\lambda-1}x(q(t))=e(t),\quad t\in\mathbb{T}
Yuangong Sun
doaj   +1 more source

Dynamics of the inflationary flow equations [PDF]

open access: yesPhysical Review D, 2005
9 pages 4 figures.
Chongchitnan, Sirichai   +1 more
openaire   +2 more sources

Dynamics of the Painlevé-Ince Equation

open access: yesResults in Mathematics, 2022
AbstractThe Painlevé-Ince differential equation $$y'' + 3 y y' + y^3=0$$ y ′ ′ + 3 y
openaire   +2 more sources

Cm-smoothness of invariant fiber bundles for dynamic equations on measure chains [PDF]

open access: yes, 2004
We present a new self-contained and rigorous proof of the smoothness of invariant fiber bundles for dynamic equations on measure chains or time scales.
Stefan Siegmund   +5 more
core   +1 more source

Existence of positive solutions for second-order nonlinear neutral dynamic equations on time scales

open access: yesMoroccan Journal of Pure and Applied Analysis, 2021
In this article we study the existence of positive solutions for second-order nonlinear neutral dynamic equations on time scales. The main tool employed here is Schauder’s fixed point theorem.
Bouchelaghem Faycal   +2 more
doaj   +1 more source

Dynamics of Nanoparticle Self-Assembly by Liquid Crystal Sorting in Two Dimensions

open access: yesFrontiers in Physics, 2021
We study nonlinear dynamical equations for coupled conserved and non-conserved fields describing nanoparticle concentration and liquid crystal order parameter, respectively, and solve them numerically over bidimensional domains. These equations model the
F. Gael Segura-Fernández   +3 more
doaj   +1 more source

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