Multiplicity of positive solutions for a nonlinear differential equation with nonlinear boundary conditions
Volume 69 / 1998
Annales Polonici Mathematici 69 (1998), 155-165 DOI: 10.4064/ap-69-2-155-165
We study the existence and multiplicity of positive solutions of the nonlinear equation u''(x) + λh(x)f(u(x)) = 0 subject to nonlinear boundary conditions. The method of upper and lower solutions and degree theory arguments are used.