Introduction to Functional Analysis by Daniel Daners
This PDF book covers the 
following topics related to Functional Analysis : The Axiom of Choice and Zorn’s 
Lemma, Banach Spaces, Banach algebras and the Stone-Weierstrass Theorem, Hilbert 
Spaces, Linear Operators, Duality, Spectral Theory.
Author(s): Daniel Daners, School of 
Mathematics and Statistics, University of Sydney
123 Pages