Nonuniform power instability and Lyapunov sequences
  The aim of this paper is to present necessary and sufficient conditions for nonuniform power instability property of linear discrete-time systems in Banach spaces. A characterization of the nonuniform power instability in terms of Lyapunov sequences is also given. 
Ioan-Lucian Popa, Traian Ceausu, Mihail Megan
math.DS