The ordinal structure of the set of fixed points of a monotone operator acting in a partially ordered space is investigated. The conditions for the stability of the set of fixed points to changes in the monotone operator are obtained. Based on these results, a boundary value problem and a control system for the differential equation of a neural network — a Hopfield-type model of the electrical activity of the brain with a continuous and discontinuous activation function — are investigated.
E.S. Zhukovskiy (Wed,) studied this question.