Results 91 to 100 of about 623 (125)

Almost periodic solution of a discrete competitive system with delays and feedback controls

Open Mathematics, 2019
A discrete nonlinear almost periodic multispecies competitive system with delays and feedback controls is proposed and investigated. We obtain sufficient conditions to ensure the permanence of the system.
Xue Yalong, Xie Xiangdong, Lin Qifa
doaj   +1 more source

On the connection between global centers and global injectivity in the plane [PDF]

arXiv, 2017
In this note we present a generalization of a result of Sabatini relating global injectivity and global centers. The shape of the image of the map is taking into account. Our proofs do not use Hadamard's theorem.
arxiv  

High Multiplicity and Chaos for an Indefinite Problem Arising from Genetic Models

Advanced Nonlinear Studies, 2020
We deal with the periodic boundary value problem associated with the parameter-dependent second-order nonlinear differential ...
Boscaggin Alberto, Feltrin Guglielmo, Sovrano Elisa   +2 more
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Existence and uniqueness of (ω,c)-periodic solutions of semilinear evolution equations [PDF]

arXiv, 2019
In this work we study the existence and uniqueness of ({\omega},c)-periodic solutions for semilinear evolution equations in complex Banach spaces.
arxiv  

Weak and strong composition conditions for the Abel differential equation [PDF]

arXiv, 2013
We establish an equivalence between two forms of the composition condition for the Abel differential equation with trigonometric coefficients.
arxiv  

Ambrosetti–Prodi Periodic Problem Under Local Coercivity Conditions

Advanced Nonlinear Studies, 2018
In this paper we focus on the periodic boundary value problem associated with the Liénard differential equation x′′+f⁢(x)⁢x′+g⁢(t,x)=s{x^{\prime\prime}+f(x)x^{\prime}+g(t,x)=s}, where s is a real parameter, f and g are continuous functions and g is T ...
Sovrano Elisa, Zanolin Fabio
doaj   +1 more source

Existence and multiplicity results for non-autonomous second-order Hamiltonian systems

Advances in Nonlinear Analysis
In this article, using the least action principle and minimax methods in critical point theory, some existence and multiplicity results for periodic solutions of second-order Hamiltonian systems are obtained.
Liu Chungen, Zhong Yuyou
doaj   +1 more source

Non-hyperbolic P-Invariant Closed Characteristics on Partially Symmetric Compact Convex Hypersurfaces

Advanced Nonlinear Studies, 2018
Let n≥2{n\geq 2} be an integer, P=diag⁢(-In-κ,Iκ,-In-κ,Iκ){P=\mathrm{diag}(-I_{n-\kappa},I_{\kappa},-I_{n-\kappa},I_{\kappa})} for some integer κ∈[0,n]{\kappa\in[0,n]}, and let Σ⊂ℝ2⁢n{\Sigma\subset{\mathbb{R}}^{2n}} be a partially symmetric compact ...
Liu Hui, Zhu Gaosheng
doaj   +1 more source

Simple curves on surfaces [PDF]

arXiv, 1999
We show that the number of simple closed geodesics of length bounded by L on a hyperbolic surface of genus g with c cusps and b boundary components grows roughly like L^{6g+2b+2c-6}. This has been conjectured for some time.
arxiv  

Subharmonic solutions of first-order Hamiltonian systems

Advances in Nonlinear Analysis
The aim of this article is to study subharmonic solutions of superquadratic and asymptotically (constant) linear nonautonomous Hamiltonian systems in R2n{{\mathbb{R}}}^{2n} respectively, and to improve the results in Professor Liu’s [Subharmonic ...
Zhou Yuting
doaj   +1 more source