
doi: 10.1007/bf02790220
The problem of exact and approximate controllability for the wave equation with boundary control is studied. It is introduced the duality method which allows the treatment of the original problem via variational inequalities. Many pertinent remarks are made and some open problems are formulated.
duality method, Wave equation, approximate controllability, variational inequalities
duality method, Wave equation, approximate controllability, variational inequalities
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