
This paper deals with the existence of positive solutions for the \(n\)-dimensional quasilinear system \[ ({\mathbf \Phi}({\mathbf u}'))' + \lambda {\mathbf h}(t) {\mathbf f}({\mathbf u}) = 0, \quad 0 1\). Assume that there exists the following limits: \[ f_0^i = \lim_{\| {\mathbf u}\| \to 0} f^i({\mathbf u}) / \varphi(\| {\mathbf u}\| ), \quad f_\infty^i = \lim_{\| {\mathbf u}\| \to \infty} f^i({\mathbf u}) / \varphi(\| {\mathbf u}\| ) \] for \(i=1,\dots,n\). Let \(f_0=\max\{f_0^1,\dots,f_0^n\}\) and \(f_\infty=\max\{f_\infty^1,\dots,f_\infty^n\}\). It is shown that the boundary value problem has a positive solution, for certain finite intervals of \(\lambda\), if one of \(f_0\) and \(f_\infty\) is large enough and the other one is small enough. The proof is based on fixed point theorems in a cone.
Nonlinear boundary value problems for ordinary differential equations, Applications of operator theory to differential and integral equations, Positive solutions to nonlinear boundary value problems for ordinary differential equations
Nonlinear boundary value problems for ordinary differential equations, Applications of operator theory to differential and integral equations, Positive solutions to nonlinear boundary value problems for ordinary differential equations
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