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What are really helpful math resources out there on the web?

Please don't only post a link but a short description of what it does and why it is helpful.

Please only one resource per answer and let the votes decide which are the best!

edited Mar 9 2010 at 10:40

vonjd

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6 revisions, 2 users
vonjd 70%

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I edited your question a bit, my main goal was to remove the reference to WolframAlpha; and make the text easier to read. But feel free to revert if you like! (You can see the edit history and revert by clicking on "edited ... ago") – Ilya Nikokoshev Nov 4 2009 at 21:23

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The answers below are great. Here's an idea I don't see that may be interesting to think about starting: An online example repository. This would be a place where one could upload and search various "first nontrivial example" notes. I think such a thing would really move mathematics along. – Jon Bannon Apr 20 2012 at 13:38

anon · Answer 1 · 2010-10-17 22:19:46Z UTC

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An excellent catalogue of mathematical information available on the web is Keith Mathhews'

http://www.numbertheory.org/ntw/gateways.html

and if you are interested in Number Theory, see

http://www.numbertheory.org/ntw/

answered Oct 17 2010 at 22:19

anon

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I. J. Kennedy · Answer 2 · 2010-10-27 01:35:55Z UTC

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http://functions.wolfram.com/

answered Oct 27 2010 at 1:35

I. J. Kennedy

community wiki

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We have that already - see above – vonjd Oct 27 2010 at 6:27

jjcale · Answer 3 · 2011-11-16 19:39:24Z UTC

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For people who are interested in prime factorization : www.mersenneforum.org

answered Nov 16 2011 at 19:39

jjcale

community wiki

Yazdegerd III · Answer 4 · 2013-01-03 17:51:07Z UTC

Jahrbuch Database

http://www.emis.de/MATH/JFM/

A sort of Mathscinet and Zentralblatt for the period 1868-1942. Most of the reviews are in German. It is interesting to read the reviews written by mathematicians like Frobenius, Hilbert, Minkowski, Hasse, E. Noether, Artin, Mittag-Leffler, Landau, Van der Waerden, ...

GArunkumar · Answer 5 · 2013-04-12 14:11:06Z UTC

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NPTEL provides E-learning through online Web and Video courses in Mathematics organized by Indian Institute of Technology. http://nptel.iitm.ac.in/

answered Apr 12 at 14:11

GArunkumar

community wiki

nonlinearism · Answer 6 · 2013-04-12 15:40:56Z UTC

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www.proofwiki.org

It is a wikipedia, for proofs.

answered Apr 12 at 15:40

nonlinearism

community wiki

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