Tarasenko, A. Karelin, O. Pérez, G. González, M.
A method for the study of systems with renewable resources is proposed. The individual and the group parameters are separated and a discretization of time is carried out. Weobtain equilibrium proportions which are functional equations with shift. A cyclic model and an open model are considere d. Conditions for the existence and uniqueness of the solutionare formulated for the cyclic model. For the open model, the system?s evolution is analyzed.