Results 81 to 90 of about 8,072 (173)

Unbounded upper and lower solution method for third-order boundary-value problems on the half-line

Electronic Journal of Differential Equations, 2009
In this article, we prove the existence of unbounded upper and lower solutions of third-order boundary-value problems on the half-line. Here the Nagumo conditions play an important role in the nonlinear term involved in the second-order derivatives.
Chuanzhi Bai, Chunhong Li
doaj  

Existence of solutions for a fourth-order boundary-value problem

Electronic Journal of Differential Equations, 2008
In this paper, we use the lower and upper solution method to obtain an existence theorem for the fourth-order boundary-value problem $$displaylines{ u^{(4)}(t)=f(t,u(t),u'(t),u''(t),u'''(t)),quad ...
Yang Liu
doaj  

Existence of positive radial solution for the elliptic system on an exterior domain

Boundary Value Problems
This article discusses the existence of positive radial solution for the elliptic system { − △ u = K ( | x | ) f ( | x | , u , v , | ∇ u | ) , x ∈ Ω , − △ v = K ( | x | ) g ( | x | , u , v , | ∇ v | ) , x ∈ Ω , α 1 u + β 1 ∂ u ∂ n | ∂ Ω = 0 , α 2 v + β 2
Dan Wang, Yongxiang Li, Shengbin Yang
doaj   +1 more source

A Hartman-Nagumo type condition for a class of contractible domains

, 2013
We generalize an existence result on second order systems with a nonlinear term satisfying the so-called Hartman-Nagumo condition. The generalization is based on the use of Gauss second fundamental form and continuation techniques.
Amster, Pablo, Haddad, Julián
openaire   +2 more sources

Direct Estimation of Parameters in ODE Models Using WENDy: Weak-Form Estimation of Nonlinear Dynamics. [PDF]

Bull Math Biol, 2023
Bortz DM, Messenger DA, Dukic V.
europepmc   +1 more source

Naguma type conditions for second order differential equations with deviating arguments

, 1999
The authors generalize the Nagumo type conditions in order to obtain the existence of solutions to second-order differential equations with deviating arguments. Applications of the obtained results are given. In particular, a priori bounds for the derivative of solutions to second-order boundary value problems with deviating arguments is derived.
Ntouyas, S. K., Tsamatos, P. Ch.
openaire   +2 more sources

Generalized FitzHugh-Nagumo equations with Caputo gH-differentiability: A novel fuzzy fractional approach to digital memristor networks. [PDF]

PLoS One
Yousuf M, Ahmad U, Muhammad G, Alsulami H.   +3 more
europepmc   +1 more source

Three-dimensional image reconstruction technology in laparoscopic pyeloplasty for horseshoe kidney-associated ureteropelvic junction obstruction: a case series study. [PDF]

BMC Urol
Kandori S, Kojo K, Hoshi A, Takahashi R, Sakurai H, Isoda B, Suzuki S, Yamaguchi A, Tanuma K, Nitta S, Shiga M, Nagumo Y, Ikeda A, Kawahara T, Mathis BJ, Nishiyama H.   +15 more
europepmc   +1 more source

Flexible modulation of hybrid feedback loops in competitive biological oscillators. [PDF]

NPJ Syst Biol Appl
Zhao P, Liu J, Bao T, Huo H, Yuan Y, Fang T.   +5 more
europepmc   +1 more source

Reliability and robustness of oscillations in some slow-fast chaotic systems. [PDF]

Chaos, 2023
Jaquette J, Kedia S, Sander E, Touboul JD.   +3 more
europepmc   +1 more source