good book for definitions of spectrum and eigenvalues

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I am trying to find references for definitions of eigenvalues, eigenfunctions and spectrum of operators any advice??

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In general in a book in linear algebra you will only find the definitions of eigenvalues and eigenvectors and not the definition of the spectrum of an operator on a Banach space.

All definitions concerning operator- and spectral- theory can be found for instance in

Walter Rudin's Functional Analysis

or in

the book "Introduction to Functional Analysis" written by A.E. Taylor and D:C: Lay.