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!
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!
Two sites created by my former wonderful A level Mathematics teacher: www.whitegroupmaths.com www.a-levelmaths.com
He has generously written tons of topic summaries, worked revision problem sets and other learning material made mostly free to us students. Felt he deserves a mention for all his efforts :) Thanx n hope u will benefit from them!
Estella
A community database of rings examples, searchable by properties: http://ringtheory.herokuapp.com/
It is very similar to pi-base, which is a more famous database but for topological spaces examples.
For people who are interested in prime factorization : http://www.mersenneforum.org
Sci-Hub is pretty helpful in accessing articles, even for those researchers who already have access to several journals. The interface is great, the site is pretty fast, and the database is huge. See this article and other linked articles there for a nice overview of who all are downloading pirated papers.
Edit: as pointed out in the comments, it should be noted that there is an ongoing lawsuit against the website.
I just found a very interesting site which has lots of free math videos even up to some more advanced topics:
http://www.hippocampus.org/
http://www.math.fsu.edu/Virtual/
This site contains plenty of useful math resources.
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
For knot theorists, there are two really cool databases:
If you want to find a relationship between data in the form of closed form formulas this tool is - to the best of my knowledge - the best one:
NPTEL provides E-learning through online Web and Video courses in Mathematics organized by Indian Institute of Technology. http://nptel.iitm.ac.in/