J. E. Lagnese
(2010)
We consider transmission problems for general second order linear hyperbolic
systems having piecewise constant coefficients in a bounded, open connected
set with smooth boundary and controlled through the Dirichlet boundary
condition. It is proved that such a system is exactly controllable in an
appropriate function space provided the interfaces where the coefficients
have a jump discontinuity are all star-shaped with respect to one and the
same point and the coefficients satisfy...