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"Teori spektral adalah salah satu cabang utama dari analisis fungsional. Dalam teori spektral, dipelajari mengenai operator-operator inversi dari operator linear. Yang diperhatikan adalah sifat-sifat umumnya dan hubungan dengan operator linear aslinya. Dalam teori spektral, dikenal dua himpunan yang saling bebas yaitu spektrum dan himpunan resolvent. Operator linear yang diperhatikan pada skripsi ini adalah operator linear terbatas dan operator linear self adjoint terbatas yang telah dikenal di analisis fungsional. Sifat spektrum dan himpunan resolvent dari kedua operator linear tersebut menjadi hal utama yang dikaji di skripsi ini.

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Spectral theory is one of the main branches of functional analysis. Spectral theory is study about the inverse operators of linear operator. It is concerned with their general properties and their relations to the original linear operator. In spectral theory, there are two adjoint sets called spectrum and resolvent set. There are two linear operators in this undergraduate thesis, they are bounded linear operator and bounded self adjoint linear operator from functional analysis. Spectrum and resolvent set properties of those linear operators is the main part of this undergraduate thesis."

"Summary:This monograph provides a systematic treatment of the abstract theory of adjoint semigroups. Following a presentation of the basic elementary results, the text discusses such topics as interpolation and extrapolation, weak-continuous semigroups and Hille-Yosida operators"

"The book is a graduate text on unbounded self-adjoint operators on Hilbert space and their spectral theory with the emphasis on applications in mathematical physics (especially, Schrödinger operators) and analysis (Dirichlet and Neumann Laplacians, Sturm-Liouville operators, Hamburger moment problem) . Among others, a number of advanced special topics are treated on a text book level accompanied by numerous illustrating examples and exercises. The main themes of the book are the following, spectral integrals and spectral decompositions of self-adjoint and normal operators, perturbations of self-adjointness and of spectra of self-adjoint operators, forms and operators, and self-adjoint extension theory :boundary triplets, Krein-Birman-Vishik theory of positive self-adjoint extension."

"Don't let the title fool you! If you are interested in numerical analysis, applied mathematics, or the solution procedures for differential equations, you will find this book useful. Because of Lanczos' unique style of describing mathematical facts in nonmathematical language, Linear Differential Operators also will be helpful to nonmathematicians interested in applying the methods and techniques described. Originally published in 1961, this Classics edition continues to be appealing because it describes a large number of techniques still useful today. Although the primary focus is on the analytical theory, concrete cases are cited to forge the link between theory and practice. Considerable manipulative skill in the practice of differential equations is to be developed by solving the 350 problems in the text. The problems are intended as stimulating corollaries linking theory with application and providing the reader with the foundation for tackling more difficult problems. Lanczos begins with three introductory chapters that explore some of the technical tools needed later in the book, and then goes on to discuss interpolation, harmonic analysis, matrix calculus, the concept of the function space, boundary value problems, and the numerical solution of trajectory problems, among other things. The emphasis is constantly on one question: "What are the basic and characteristic properties of linear differential operators?" In the author's words, this book is written for those "to whom a problem in ordinary or partial differential equations is not a problem of logical acrobatism, but a problem in the exploration of the physical universe. To get an explicit solution of a given boundary value problem is in this age of large electronic computers no longer a basic question. But of what value is the numerical answer if the scientist does not understand the peculiar analytical properties and idiosyncrasies of the given operator? The author hopes that this book will help in this task by telling something about the manifold aspects of a fascinating field.""