Weak solutions for a class of quadratic operator-differential equations

"This monograph presents results of existence and uniqueness of generalized solutions for two classes of quadratic operator-differential equations with constant coefficients: (1) Au(t) + Bu'(t) - Du"(t) = 0 and (2) Au(t) + iBu'(t) + Da"(t) = 0, where A, B and D are self-adjo...