Rodríguez Bernal, AníbalVidal López, Alejandro2023-06-202023-06-2020080022-039610.1016/j.jde.2008.02.046https://hdl.handle.net/20.500.14352/49703We show the existence of two special equilibria, the extremal ones, for a wide class of reaction–diffusion equations in bounded domains with several boundary conditions, including non-linear ones. They give bounds for the asymptotic dynamics and so for the attractor. Some results on the existence and/or uniqueness of positive solutions are also obtained. As a consequence, several well-known results on the existence and/or uniqueness of solutions for elliptic equations are revisited in a unified way obtaining, in addition, information on the dynamics of the associated parabolic problem. Finally, we ilustrate the use of the general results by applying them to the case of logistic equations. In fact, we obtain a detailed picture of the positive dynamics depending on the parameters appearing in the equationengjournal articlehttp://www.sciencedirect.com/science/journal/00220396open access517.9Reaction-diffusion equationExtremal equilibriaAttractorNonlinear boundary conditionsDirichlet boundary conditionRobin boundary conditionEcuaciones diferenciales1202.07 Ecuaciones en Diferencias