文摘
Let \(B\subset \mathbb {R}^N\), \(N\ge 3\), be the unit ball. We study the global bifurcation diagram of the solutions of $$\begin{aligned} {\left\{ \begin{array}{ll} \Delta u+\lambda f(u)=0 &{}\quad \text {in}\ B,\\ u=0 &{} \quad \text {on}\ \partial B,\\ u>0 &{} \quad \text {in}\ B, \end{array}\right. } \end{aligned}$$