“…Among the most significant concepts in this field are the exponential dichotomy and the polynomial dichotomy. The importance of the role played by these notions in the theory of dynamical systems is illustrated by the appearance of numerous papers in this domain for the uniform case ([3,10,14,18,23,24,30]) as well as for the nonuniform case ( [1,2,5,6,16,22,24,[29][30][31]).…”