For studying the evolution of the transverse deflection of an extensible beam derived from
the connection mechanics, we investigate the initial boundary value problem of nonlinear …

We present some results which show the rich and complicated structure of the solutions of
the second order differential equation ẍ+ w (t) g (x)= 0 when the weight w (t) changes sign …

We propose, in the general setting of topological spaces, a definition of two-dimensional
oriented cell and consider maps which possess a property of stretching along the paths with …

Multi-layer radial solutions for a supercritical Neumann problem - ScienceDirect Skip to main
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We study the periodic boundary value problem associated with the second order nonlinear
differential equation u ″+ cu′+(a+(t)− μ a−(t)) g (u)= 0, where g (u) has superlinear growth …

We study the second-order nonlinear differential equation u''+ a (t) g (u)= 0 u′′+ a (t) g
(u)= 0, where gg is a continuously differentiable function of constant sign defined on an open …

We study the problem of the existence and multiplicity of positive periodic solutions to the
scalar ODE where g (x) is a positive function on R+, superlinear at zero and sublinear at …

We consider some nonlinear second order scalar ODEs of the form x+ f (t, x)= 0, where f is
periodic in the t–variable and show the existence of infinitely many periodic solutions as well …

Multiple positive solutions of superlinear elliptic problems with sign-changing weight Page 1 J.
Differential Equations 214 (2005) 36–64 www.elsevier.com/locate/jde Multiple positive …

In this paper we are concerned with a differential equation of the form x ̈+ cx ̇+ q (t) g (x)=
0, t∈(a, b), where−∞⩽ a< b⩽+∞, q has infinitely many zeros in (a, b), and g is superlinear …