V. Komornik et P. Loreti, BOUNDARY OBSERVABILITY OF COUPLED SYSTEMS BY VECTORIAL NONHARMONIC ANALYSIS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 324(8), 1997, pp. 895-900
We propose a new approach to study of the observability of coupled lin
ear systems. It is based on a generalization of some results of nonhar
monic analysis to vector-valued functions. Applying this method, we an
swer some questions of J.-L. Lion on the boundary observability of cou
pled linear distributed systems in some particular cases.