Functional Analysis: An Introduction to Metric Spaces, Hilbert Spaces, and Banach Algebras

This textbook provides an introduction to functional analysis suitable for lecture courses to final year undergraduates or beginning graduates.

Starting from the very basics of metric spaces, the book adopts a self-contained approach to Banach spaces and operator theory that covers the main topics, including the spectral theorem, the Gelfand transform, and Banach algebras. Various applications, such as least squares approximation, inverse problems, and Tikhonov regularization, illustrate t...