Global bifurcation of positive solutions for a class of superlinear first-order differential systems

Bifurcation of positive periodic solutions of first-order impulsive differential equations

Periodic Solutions of Superlinear Impulsive Differential Systems

We develop continuation technique to obtain periodic solutions for superlinear planar differential systems of first order with impulses. Our approach was inspired by some works by Capietto, Mawhin and Zanolin in analogous problems without impulses and uses instead of Brouwer degree the much more elementary notion of essential map in the sense of fixed point theory. AMS (MOS) subject classificat...

On Global Solutions for Partial Differential Equations of First Order

In this note we state a theorem which guarantees the existence and uniqueness of a global solution for the Cauchy initial value problem for a complete, regular system of partial differential equations of first order for one unknown function on a manifold—all data being of class C. This result depends on one hand on an investigation of the following problem for a w-dimensional C°°-manifold W, wh...

Positive Solutions and Global Bifurcation of Strongly Coupled Elliptic Systems

In this article, we study the existence of positive solutions for the coupled elliptic system −∆u = λ(f(u, v) + h1(x)) in Ω, −∆v = λ(g(u, v) + h2(x)) in Ω, u = v = 0 on ∂Ω, under certain conditions on f, g and allowing h1, h2 to be singular. We also consider the system −∆u = λ(a(x)u+ b(x)v + f1(v) + f2(u)) in Ω, −∆v = λ(b(x)u+ c(x)v + g1(u) + g2(v)) in Ω, u = v = 0 on ∂Ω, and prove a Rabinowitz...

ON THE PERIODIC SOLUTIONS OF A CLASS OF nTH ORDER NONLINEAR DIFFERENTIAL EQUATIONS *

The nth order differential equation x + c (t )x + ƒ( t,x) = e(t),n>3 is considered. Using the Leray-Schauder principle, it is shown that under certain conditions on the functions involved, this equation possesses a periodic solution.