A counterexample to the nodal domain conjecture and a related semilinear equation
Chang‐Shou Lin, Wei-Ming Ni · Proceedings of the American Mathematical Society · 1988
In this paper we first establish a nonuniqueness result for a semilinear Dirichlet problem of which the nonlinearity is of super-critical growth. We then apply this result to construct a Schrödinger operator on a domain Ω \Omega such that the second eigenfunctions of this operator (with zero Dirichlet boundary data) have their nodal sets completely contained in the interior of the domain Ω \Omega .