THEORY AND APPROXIMATION OF OPTIMAL CONTROL PROBLEMS DEFINED BY NONLINEAR ELLIPTIC PARTIAL DIFFERENTIAL EQUATIONS
Abstract
WE CONSIDER AN OPTIMAL CONTROL PROBLEM FOR SYSTEMS DEFINED BY NONLINEAR ELLIPTIC PARTIAL DIFFERENTIAL EQUATIONS. USING RELAXATION THEORY WE PROVE THE EXISTENCE OF OPTIMAL RELAXED CONTROLS AND DERIVE NECESSARY CONDITIONS OF OPTIMALITY. WETHEN DISCRETIZE THE PROBLEM BY USING A FINITE ELEMENT METHOD AND PROVE THE ANALOGUE THEOREMS FOR THE DISCRETE PROBLEM. MOREOVER, WE STUDY THE BEHAVIOR IN THELIMIT OF THE PROPERTIES OF OPTIMALITY AND EXTREMALITY. FINALLY, WE APPLY OPTIMIZATION METHODS WITH RELAXED CONTROLS TO THE ABOVE PROBLEMS AND ALSO A METHOD OF APPROXIMATION OF RELAXED CONTROLS BY CLASSICAL ONES.
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