Editing Spectral theory (section)

==References==

* {{Cite book |title=Spectral Theory and Differential Operators; ''Volume 42 in the ''Cambridge Studies in Advanced Mathematics |author=Edward Brian Davies |publisher=Cambridge University Press |year=1996 |url=https://books.google.com/books?id=EXtKuJAksSUC&q=Spectral+theory+ |isbn=0-521-58710-7 }}
* {{Cite book |title=Linear Operators, Spectral Theory, Self Adjoint Operators in Hilbert Space (Part 2) |first1= Nelson |last1=Dunford |first2=Jacob T |last2=Schwartz |publisher=Wiley |year=1988 |url=https://books.google.com/books?id=eOFfQQAACAAJ |isbn=0-471-60847-5 |edition=Paperback reprint of 1967  }}
*{{Cite book |title=Linear Operators, Spectral Operators (Part 3) |first1= Nelson |last1=Dunford |first2=Jacob T |last2=Schwartz |publisher=Wiley |year=1988 |isbn=0-471-60846-7 |url=https://books.google.com/books?id=B0SeJNIh3BwC |edition=Paperback reprint of 1971}}
* {{Cite book |title=Mathematical Physics: a Modern Introduction to its Foundations |author= Sadri Hassani |publisher=Springer |year=1999 |chapter-url=https://books.google.com/books?id=BCMLOp6DyFIC&pg=RA1-PA109|chapter=Chapter 4: Spectral decomposition |isbn=0-387-98579-4   }}
*{{Springer|id=S/s086520|title=Spectral theory of linear operators}}
* {{Cite book |title=Spectral Theory of Banach Space Operators; |author=Shmuel Kantorovitz|year=1983 | publisher= Springer}}
* {{Cite book |title=Linear Operator Theory in Engineering and Science; ''Volume 40 of Applied mathematical sciences'' |author=Arch W. Naylor, George R. Sell |page=411 |chapter=Chapter 5, Part B: The Spectrum |chapter-url=https://books.google.com/books?id=t3SXs4-KrE0C&q=%22resolution+of+the+identity%22&pg=PA411 |isbn=0-387-95001-X |year=2000 |publisher=Springer}}
* {{Cite book |title=Mathematical Methods in Quantum Mechanics; With Applications to Schrödinger Operators |author= Gerald Teschl |author-link= Gerald Teschl |publisher= American Mathematical Society |year=2009 |url=https://www.mat.univie.ac.at/~gerald/ftp/book-schroe/ |isbn=978-0-8218-4660-5   }}
* {{Cite book |title=Spectral Theory and Quantum Mechanics; Mathematical Foundations of Quantum Theories, Symmetries and Introduction to the Algebraic Formulation 2nd Edition |author= Valter Moretti |author-link= Valter Moretti |publisher= Springer |year=2017 |url=https://www.springer.com/it/book/9783319707051|isbn=978-3-319-70705-1 }}