2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153195: We establish existence of an infinite family of exponentially-decaying non-radial $C^2$ solutions to the equation $Δu + f(u) = 0$ on $R^2$ for a large class of nonlinearities $f$. These solutions have the form $u(r,θ)=e^{i mθ}w(r)$, where $r$ and $θ$ are polar coordinates, $m$ is an integer, and $w:[0,\infty ) \to R$ is exponentially decreasing far from the origin. We prove there is a solution with each prescribed number of nodes.21 pages, ordinary TeXPattern Formation and Solitonstext