Quasidifferentiability and observability of linear nonstationary systems
A. I. Astrovskii, И. В. Гайшун · Differential Equations · 2009
We suggest a method for studying the observability of linear nonstationary ordinary differential systems on the basis of the quasidifferentiability of the output variables with respect to some lower-triangular matrix. This approach permits one to weaken the smoothness requirement on the coefficients in the statement of observability criteria.