... 110 Analysis and Control of Linear Systems The object of this chapter is to describe certain structural properties of linear systems that condition the resolution of numerous control problems ... Journal of Control, vol 72, no 15, p 139 2-1 40 1, 1999 [MOR 73] MORSE A.S., “Structural invariants of linear multivariable systems , SIAM Journal of Control & Optimization, vol 11, p 44 6 -4 65, 1973 ... [4. 14] From the point of view of terminology, the pi singularities are called eigenvalues of A, (internal) poles of the dynamic system [4. 12] and zeros of the beam [pI-A] The companion form of...