Mathematical Atlas Online
vitaly.friedman writes "Whether you are looking for Complex analysis, Differential Equatiions or Probability and Statistics references, the Mathematical Atlas covers the whole area of mathematics and related subjects. The so-called 'Gateway to Mathematics' is a collection of articles about aspects of mathematics at and above the university level, but (usually) not at the level of current research. "The goal of this collection is to introduce the subject areas of modern mathematics, to describe a few of the milestone results and topics, and to give pointers to some of the key resources where further information is to be found. Like any good atlas, we try to present several ways to look at each area and to show its relationship with neighboring areas and sub-areas."
http://mathworld.wolfram.com/ -- great resource, not necessarily only about Mathematica (TM), but math in general.
Paul B.
F.P.???
That's Davin Rusin's website. He just moved it to a new domain. It was on his edu website before. He's a nice guy. He's a regular poster on sci.math and (through cross-posting) sci.logic.
After all, I am strangely colored.
Overall, kudos for the content and generally improving the web.
Well, since you mention Numerical Recipes, it is obligatory to post one of the many rebuttals. Basically, the books have some okay discussions (and cover a very WIDE range of subjects) but their code is crap. I say that boldly, since I must maintain code that was originally developed using their C libraries. There have always been better alternatives, and especially these days when so much is available on the web.
r y p osition
http://en.wikipedia.org/wiki/Numerical_Recipes
http://en.wikipedia.org/wiki/GNU_Scientific_Libra
http://en.wikipedia.org/wiki/Linear_least_squares
http://en.wikipedia.org/wiki/Singular_value_decom
http://www.netlib.org/
"It's overkill, of course. But you can never have too much overkill." - Anonymous Slashdot Coward