“…Then the system has the same Markov parameters CAnB, n = 1,2, Thus, in analogy to the finite-dimensional case, the identifiability of the infinite-dimensional system is guaranteed if it is in a canonical form such that if confined to this form the operators A, B, C are uniquely determined by the Markov parameters. The major challenge will be an explicit definition of the canonical form of a linear Hilbert space-valued system (I), (2).…”