This book is aimed at a new generation of researchers and graduate students in the field. Written in a user-friendly, motivating style, fundamental topics are presented in a systematic fashion, i.e., set theory, algebraic structures, topological structures, Banach spaces, Hilbert Spaces, culminating with the Spectral Theorem, one of the landmarks in the theory of operators on Hilbert spaces. The exposition is concept-driven and as much as possible avoids the formula-computational approach. The key features of this largely self-contained work include: required background material to each chapter; fully rigorous proofs, over 300 of them, are specially tailored to the presentation and some are new; more than 100 examples and, in several cases, interesting counter examples that demonstrate the frontiers of an important theorem; over 300 problems, many with hints - both problems and examples underscore further auxiliary results and extensions of the main theory - in this non-traditional framework, the reader is challenged and has a chance to prove the principal theorems anew. This work is an excellent text for the classroom as well as a self-study resource for researchers. Prerequisites include an introduction to analysis and to functions of a complex variable, which most first-year graduate students in mathematics, engineering, or another formal science have already acquired.

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"The author endeavors to present the concepts and ideas as an alternative to the computational approach, trying to avoid long calculations by stressing the mathematical thoughts behind the statements. . . . many problems [are] stated throughout the book, very often accompanied by hints." —Mathematical Reviews "This is a rigorous, logically well-organized textbook presenting basic principles and elementary theory of operators. It is written with great care, gradually increasing in complexity. The forte features of the book are the teaching style, illuminating explanation of numerous delicate points, detailed presentation of topics. Hence, the book can be warmly recommended to a first work for the study of operator theory . . . it is an admirable work for a modern introduction in operator theory." —Zentralblatt Math

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