Nodal Solutions for sublinear-type problems with Dirichlet boundary conditions

Denis Bonheure, Ederson Moreira dos Santos, Enea Parini +2

We consider nonlinear second order elliptic problems of the type \[ -Δu=f(u) \text{ in } Ω, \qquad u=0 \text{ on } \partial Ω, \] where $\Omega$ is an open $C^{1,1}$-domain in $\mathbb{…