TITLE: Good book for self study of functional analysis
QUESTION [93 upvotes]: I am a EE grad. student who has had one undergraduate course in real analysis (which was pretty much the only pure math course that I have ever done). I would like to do a self study of some basic functional analysis so that I can be better prepared to take a graduate course in that material in my university. I plan to do that next fall so I do have some time to work through a book fully. Could some one recommend some good books to start working on this? 
Thanks in advance

REPLY [2 votes]: Consider the book by Haase: Functional Analysis: An Elementary Introduction. It's published in the Graduate Studies in Mathematics series, but it only assumes a background in linear algebra and elementary analysis (ie. it builds the basics of Lebesgue theory for you) and has a lot of the functional analysis relevant to applied mathematics.
MAA review