“…Because of the nature of the considered system, as in the cases treated in Refs. [
4, 37, 38], it is not evident how to achieve the exact controllability for the Equations () and () with arbitrary target functions (see also Bisconti and Mariano [
19] for further comments). In this paper, we restrict ourselves to analyzing the exact controllability of a suitable Galerkin's approximation scheme
for Equations () and () on
, and for
, that is
…”