Spectral Theory and Differential Op

Cambridge Studies in Advanced Mathematics #42

by Davies

In this book, Davies introduces the reader to the theory of partial differential operators, up to the spectral theorem for bounded linear operators on Banach spaces. He also describes the theory of Fourier transforms and distributions as far as is needed to analyze the spectrum of any constant coefficient partial differential operator. He also presents a completely new proof of the spectral theorem for unbounded self-adjoint operators and demonstrates its application to a variety of second order elliptic differential operators. Finally, the book contains a detailed account of the application of variational methods to estimate the eigenvalues of operators with measurable coefficients defined by the use of quadratic form techniques. Illustrated with many examples, it is well-suited to graduate-level work.

Genres: Mathematics

196 pages, Paperback

First published May 26, 1995

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[HikBook]

Example 1.2.5
The Laplacian -Delta is the most important operator and is also one of the oldest.
It was studied by Laplace in conecction with the theory of gravitation.
The Laplacian operator is symmetric on the space of smooth functions with compact support (or vanishing at the infinity?)