A First Course in Functional Analysis

"A First Course in Functional Analysis is an ideal text for upper-undergraduate  and graduate-level courses in pure and applied mathematics, statistics, and engineering.  It also serves as a valuable reference for practioners across various disciplines, including the physical sciences, economics, and finance, who would like to expand their knowledge of functional analysis." (Mathematical Reviews 2009)

"It is written in a very open, nontelegraphic style, and takes care to explain topics as they come up.  Recommended." (CHOICE Oct 2008)

"This is an excellent text for reaching students of diverse backgrounds and majors, as well as scientists from other disciplines (physics, economics, finance, and engineering) who want an introduction to functional analysis." (MAA Reviews Oct 2008)