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In this paper, by using the theorems of [Lions (1971) and Lions & Magenes (1972) ], the optimal control problem for distributed hyperbolic systems, involving second order operator with an infinite number of variables, in which constant lags appear both in the state equations and in the boundary conditions is considered. The optimality conditions for Neumann boundary conditions are obtained and the set of inequalities that characterize these conditions is formulated. Also, several mathematical examples for derived optimality conditions are presented. Finally, we consider an optimal distributed control problem for (n × n)-infinite variables hyperbolic systems.

Optimal control problem for infinite variables hyperbolic systems with time lags