This investigation introduces a new description and classification for the set of all self-adjoint operators (not just those defined by differential boundary co

This volume is based on PDE courses given by the authors at the Courant Institute and at the University of Notre Dame, Indiana. Presented are basic methods for

This investigation introduces a new description and classification for the set of all self-adjoint operators (not just those defined by differential boundary co

Complex symplectic spaces are non-trivial generalizations of the real symplectic spaces of classical analytical dynamics. This title presents a self-contained i

This is the first monograph devoted to the Sturm oscillatory theory for infinite systems of differential equations and its relations with the spectral theory. I