Functional Differential Operators and EquationsThis book deals with linear functional differential equations and operator theory methods for their investigation. The main topics are: the equivalence of the input output stability of the equation Lx = &mathsf; and the invertibility of the operator L in the class of casual operators; the equivalence of input output and exponential stability; the equivalence of the dichotomy of solutions for the homogeneous equation Lx = 0 and the invertibility of the