Abstract
The non-linear generalization of an optimal control problem of Butkovskii and Sakawa is considered, in which a system satisfying a diffusion-like non-linear partial differential equation is controlled by regulating conditions in the medium in contact with the system at one of its spatial boundaries. A necessary condition in the form of a minimum principle is developed, and a algorithm for steep descent calculation is obtained. A numerical example for a special case is included.

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