
doi: 10.1137/0517059
Die Autoren untersuchen sphärisch symmetrische Lösungen von \[ (*)\quad \Delta u+f(u)=0\quad im\quad {\mathbb{R}}^ n, \] wobei die Nichtlinearität f die folgenden Bedingungen erfüllt: (1) \(f\in C^ 1\); (2) \(f(u)=k(u)| u|^{\sigma}u+g(u)\) mit \(k(u)=k_+\), \(u\geq 0\); \(k(u)=k_-\), \(u0\), \(k_->0\) \(g(u)=O(| u|^{\gamma})\), \(g'(u)=O(| u|^{\gamma -1})\), \(| u| \to \infty\), \(\gamma 0\) mit \(\int^{u_ 0}_{0}f(s)ds=0\) ist kein kritischer Punkt. Die Autoren zeigen, daß es für \(n>1\), \(m>1\) und \(\sigma <4/(n-2)\) \((\sigma <\infty\) wenn \(n=2)\) eine \(L^ 2\)-Lösung von (*) mit genau m Nullstellenflächen gibt.
Dynamical systems and ergodic theory, infinitely many solutions, Nonlinear boundary value problems for linear elliptic equations, Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs, Nonlinear eigenvalue problems and nonlinear spectral theory for PDEs, spherically symmetric solutions, oscillation, dynamical systems approach, semilinear elliptic equation, Geometric theory, characteristics, transformations in context of PDEs
Dynamical systems and ergodic theory, infinitely many solutions, Nonlinear boundary value problems for linear elliptic equations, Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs, Nonlinear eigenvalue problems and nonlinear spectral theory for PDEs, spherically symmetric solutions, oscillation, dynamical systems approach, semilinear elliptic equation, Geometric theory, characteristics, transformations in context of PDEs
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