スペクトル理論：基礎と応用（テキスト）
Spectral Theory
Basic Concepts and Applications
Graduate Texts in Mathematics
Borthwick, David
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This textbook offers a concise introduction to spectral theory, designed for newcomers to functional analysis. Curating the content carefully, the author builds to a proof of the spectral theorem in the early part of the book. Subsequent chapters illustrate a variety of application areas, exploring key examples in detail.