Rigid systems of second-order linear differential equations

M. Isabel Garcia-Planas, M. Dolors Magret, Vladimir V. Sergeichuk +1

We say that a system of differential equations d^2x(t)/dt^2=Adx(t)/dt+Bx(t)+Cu(t), in which A and B are m-by-m complex matrices and C is an m-by-n complex matrix, is rigid if it ca…