This book is for third and fourth year university mathematics students (and Master students) as well as lecturers and tutors in mathematics and anyone who needs

{\it Elements of Operatory Theory} is aimed at graduate students as well as a new generation of mathematicians and scientists who need to apply operator theory

This book contains complete solutions to the more than six hundred exercises in the authors' book: Invitation to operator theory--foreword.

From the Preface: "This book was written for the active reader. The first part consists of problems, frequently preceded by definitions and motivation, and some

rii application of linear operators on a Hilbert space. We begin with a chapter on the geometry of Hilbert space and then proceed to the spectral theory of comp