On the number of positive radial solutions for singular superlinear problems in the exterior of a ball
Tom 151 / 2018
Colloquium Mathematicum 151 (2018), 275-288
MSC: Primary 34B16; Secondary 34B15.
DOI: 10.4064/cm7210-7-2017
Opublikowany online: 3 January 2018
Streszczenie
We prove the existence and multiplicity of positive radial solution to the problem \[ \left\{ \begin{array}{@{}l@{}} -\varDelta u=\lambda K(|x|)f(u)\quad \text{in}\ \varOmega, \\ \frac{\partial u}{\partial n}+\tilde{c}(u)u=0\ \text{on}\ |x|=r_{0},\quad u(x)\rightarrow 0\text{ as }|x|\rightarrow \infty , \end{array} \right. \] where $ \varOmega =\{x\in \mathbb{R}^{N}:|x| \gt r_{0} \gt 0\}$, $N \gt 2$, $f:(0,\infty )\rightarrow (0,\infty )$ is continuous, superlinear at $ \infty ,$ and is allowed to be singular at $ 0$.
