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I'm a student (I've been studying mathematics 4 years at the university) and I like functional analysis and topology, but I only studied 6 credits of functional analysis and 7 in topology (the basics). What I am looking for is good books that I could understand to go deeper in this areas, what do you recommend? (I can read in Spanish, English, French and German)

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4 
 Can you be a little more specific in what you are interested in? If you are interesting in spectral theory, the classic 4 volume treatise by Reed and Simon, modern methods of mathematical physics is definitely recommended. ;-) – Helge Aug 9 2011 at 1:50
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 You seem to be getting plenty of answers anyway, but I for one don't know what a "credit" means in your country. Maybe you could list the most advanced topics in functional analysis and topology that you've covered in class; then we'd all know what it would mean to "go deeper". – Tom Leinster Aug 9 2011 at 12:15
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 In class we covered Banach spaces (until Hahn-Banach theorem), Hilbert spaces (until Riesz Representation theorem) and Lp spaces. Then we did some work (three days) on Banach algebras (how to proof a subspace is dense in them). A credit in the European Union is between 20 and 25 hours of work in class and home. – dan232 Aug 9 2011 at 13:05
Not a textbook, but I recommend that you read Dieudonné's History of Functional Analysis if you can find it. Seeing the historical motivation for the basic concepts was quite enlightening for me. – Qiaochu Yuan Aug 9 2011 at 14:40
Thanks, Dan. In case you don't know, you can edit your original question using the "edit" button below it. And by the way, the credit system is not uniform through the EU: e.g. here in Scotland, a credit corresponds to about 75 minutes of lecture time. – Tom Leinster Aug 9 2011 at 15:17
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15 Answers

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I am an algebraist and not an analyst, however my favourite book on this area is "Walter Rudin: Functional Analysis".

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 Wow, I guess Rudin is THE right answer! All the more interesting since I think the book is dull as dishwater. – Igor Rivin Aug 9 2011 at 2:45
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 I don't like Rudin's book. It kinda feels like reading a grocery list to me... – Mark Schwarzmann Aug 9 2011 at 14:09
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 Maybe "an algebraist and not an analyst" wants the shortest presentation possible, so they can return to less painful topics. – Gerald Edgar Aug 9 2011 at 14:16
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 Perhaps it would be constructive to have an MO CW question asking us to construct a list of "Good mathematics books that are actually bad" together with reasons for the opinions collected. Certain books, when taken biblically by an advisor for example, can serve to dampen mathematical intuition to a criminal degree. I'm NOT saying Rudin's book has this property (I've found this book a very clear and useful reference recently). I'm not going to ask such a question because it really wouldn't be right to do so...but I'd like to have the list of answers, nevertheless! – Jon Bannon Aug 9 2011 at 18:02
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 This is not a bad book. It is just "brief" like all of Rudin's books. At every point there is the shortest, most elegant, proof. Not necessarily the proof that the students would be likely to think of themselves. @Jon: most good books are probably like that: some people like them, others hate them. Unlike run-of-the-mill books which most people never notice. – Gerald Edgar Aug 12 2011 at 13:31
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In a course I'm taking now, we're using Gerald Teschl's "Topics in Real and Functional Analysis". It seems like you may already know the first few chapters, however.

It's quite well written, and is free: http://www.mat.univie.ac.at/~gerald/ftp/book-fa/index.html

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I personally like a recent book of Helemskii Lectures and Exercises on Functional Analysis. One of the differences with other books on the subject is that it uses the categorical point of view. The author starts with a very brief introduction to the category theory and uses this language throughout the book. It's a sort of modern core of FA book, with a sidelines to some physics applications and of historic nature, a terse advertisement of the quantum functional analysis and so on (but there is no measure theory, Radon Nikodym theorem etc. which are elaborated in many excellent old textbooks.) Also it gives somewhat broader picture of FA sketching some directions and stating from time to time theorems without proofs 'that every student should know'.

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I like this one very much as well. The Russians not only know mathematics well, they certainly take pride in teaching it. – Andrew L Aug 12 2011 at 18:27
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Since you read German, my favorite is Funktionalanalysis by Dirk Werner. It's not necessarily comprehensive, but it covers a lot, has extensive historical remarks, and is extremely well-written -- I find it more readable than most math books in English (my first language).

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 +1 for mentioning this book! – S. Sra Aug 9 2011 at 16:37
I have been learning a lot of stuff from this book the last weeks and it is much better than I first thought it would be. Definitely something to look at! – Konrad Voelkel Sep 1 2011 at 20:01
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The book on Functional Analysis by Meise and Vogt

http://books.google.de/books?id=FavCGyUirRkC&dq=Meise+Vogt&hl=de&ei=F1JBTpPXItOx8QOdtPm4CQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDEQ6AEwAQ

is quite comphrensive and contains beside standard functional analysis more advanced sections on the theory of locally convex spaces. There is also a German version if you want to improve your German by reading both together.

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I'd recommend the Dunford and Schwartz. It's a classic. It's huge -- three volumes. But you don't have to read the whole series cover-to-cover. If you read half of the first volume, you'll learn about as much as reading many other books on functional analysis. Volume 1 alone is big, but it's easy to read for a book on its subject.

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Zimmer's Essential Results of Functional Analysis is a very interesting read, specially if you already know some basic stuff in functional analysis.

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 As many here I was schooled on the Rudin's book. However, for a person like me who doesn't work directly in functional analysis but by the nature of his business (dynamical systems) needs often quickly to refresh his memory I warmly recommend Zimmer's book. Probably an appropriate title for the book would be a "Functional Analysis for a working mathematician". It should be on everybody shelf. – Predrag Punosevac Sep 1 2011 at 18:03
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You might be interested in "Analysis Now" by Pedersen. A very nice book on graduate level analysis in my opinion. It covers some areas of functional analysis as well.

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Apart from the classics already mentioned (Yosida, Brezis, Rudin), a good book of functional analysis that I think is suitable not only as a reference but also for self-study, is Fabian, Habala et al. Functional Analysis and Infinite-Dimensional Geometry. It has a lot of nice exercises, it's less abstract than the usual book and provides a lot of "concrete" theorems.

And I'm not sure about it, but I heard there is a spanish translation (the original is of course in english).

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I would suggest the book by Haim Brezis: Analyse fonctionnelle, theorie et applications. It was recently translated into English and you can find the information for the English translation here.

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 I haven't seen this book before, but it looks good. :-) – Anand Aug 9 2011 at 7:23
It's a good book (I do have it at home), but it stays quite elementary : the same author covers things more deeply in "Functional Analysis, Sobolev Spaces and Partial Differential Equations" (which is mentioned in the answer I upped). Bonus points for being short and elementary, though ;-) – Julien Puydt Aug 9 2011 at 17:25
@ Snark: I think that's the same book. It's the English translation of the French book ;-) – Mahdi Majidi-Zolbanin Aug 9 2011 at 18:37
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When I was studying, I was influenced much by K. Yosida's "Functional Analysis".

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More operator theory oriented. :-) I like to use this book as a reference. To study from front cover to back cover might be difficult. – Anand Aug 9 2011 at 7:25
I used it as a source book for a course I taught. I found it very well-organised and thorough. – Amritanshu Prasad Aug 9 2011 at 9:07
This book is dense. It covers a lot in one book, but it's not something you can read quickly. – John D. Cook Aug 9 2011 at 11:04
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Some of the good books are:

  • Elements of the Theory of Functions and Functional Analysis by Kolmogorov, Fomin.

  • Functional Analysis, by F.Riesz and Nagy.

  • Functional Analysis : Spectral Theory by V.Sunder. Freely available here.

  • Analysis now. By Gert Kjeargård Pedersen. (As suggested by Theo Buehler at $\textbf{Math.SE}$

  • Stein, Elias; Shakarchi, R. (2011). Functional Analysis: An Introduction to Further Topics in Analysis. Princeton University Press. ISBN 0691113874.

  • Functional Analysis, Sobolev Spaces and Partial Differential Equations (Universitext) by Haim Brezis.

  • Elementary Functional Analysis by Georgi E. Shilov.

  • Introductory Functional Analysis with Applications by Erwin Kreyszig.

  • Notes on Functional Analysis by Rajendra Bhatia. (Hindustan Book Agency.)

  • Functional Analysis by S.Kesavan. ( Hindustan Book Agency.)

  • Elementary functional analysis By Barbara D. MacCluer

  • Functional analysis: an introduction By Yuli Eidelman, Vitali D. Milman, Antonis Tsolomitis (AMS)

  • Principles of functional analysis By Martin Schechter. (AMS)

  • You may also want to see this thread: Problem books in Functional Analysis

$\textbf{Note.}$ The books which are written in Italics are the ones which I have read partially. The ones which are not in Italics are the ones which I have come to know (by friends, teachers) are good books in Functional Analysis. Also, I really don't know which publisher actually publishes the book in foreign edition written by Kesavan and Bhatia.

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@Theo: Thanks for correcting the spelling mistakes. – Chandrasekhar Aug 9 2011 at 11:53
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 The Stein, Shakarchi series of books have been great thus far. One thing that I enjoy, at least with their Real Analysis book is that it is not as "clean" as some of the other texts that have been around for so long and therefore forces some extra thinking on the part of the reader. Some might not like this, but as a student it helped me. – Andrew Aug 9 2011 at 13:49
@Andrew: I heard that their Real Analysis text is much better than the complex analysis one. – Chandrasekhar Aug 9 2011 at 14:01
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There's no reason to listen to me either, but for delving a bit deeper, you might want to check out T. W. Körner's Fourier Analysis. The book consists of very short (often just a couple of pages) chapters which contain gems like computing the age of the Earth.

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I briefly skimmed the book once; quite entertaining. Someday I hope to read it more carefully. – S. Sra Aug 9 2011 at 16:36
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John B. Conway's "A course in functional analysis" is also pretty decent.

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I am not an analyst of any sort, so you do not need to listen to me, but I really like Lax's "Functional Analysis".

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Yes! A really great book... – Igor Rivin Aug 9 2011 at 1:32
A magnificent book that often gives new insights on classical results. – Alekk Aug 9 2011 at 9:37
AWESOME book by a master and no list of textbooks in this area would be complete without it's mention. And it's clearly designed for students with some familiarity with the concepts,so it may be just what you're looking for, Dan. – Andrew L Aug 12 2011 at 18:30

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