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Digital Library of Mathematical Functions This mockup gives an idea of the current ideas about the design and organization of the new Digital Library; these ideas are, of course, subject to change. Content only is only available in a few places. http://dlmf.nist.gov/
EquationSheet.com Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links. http://www.equationsheet.com/
Geometry Formulas and Facts An excerpt from the 30th Edition of the CRC Standard Mathematical Tables and Formulas, covering the area of Geometry (minus differential geometry), by Silvio Levy. http://geom.math.uiuc.edu/docs/reference/CRC-formulas/
Glossary of Math Terms Explains commonly used words specialized to this field. Includes examples and some graph illustrations. http://www.dpi.state.wi.us/dpi/standards/mathglos.html
Math Assistance Lists rules and formulas for a number of mathematical subjects, such as plotting graphics, functions, factoring, derivatives, integrals, matrices, vectors, and numerical analysis. In English, French and Turkish languages. http://www.ercangurvit.com/
The Math Reference Project An electronic archive of articles by Karl Dahlke on topics ranging from high school geometry up to graduate level topology. http://www.mathreference.com/
Mathematical Atlas A topical guide to modern mathematics that explains the subdisciplines. Includes graphics that represent their relative size and relationship. http://www.math.niu.edu/~rusin/known-math/welcome.html
Mathematics Resources This site comprises a large number of links to matheamtical resources, dedicated to various topics. http://www.educationindex.com/math/
Math2.Org Formerly Dave's Math Tables. Mathematical tables on-line and downloadable. http://www.math2.org/
On-Line Encyclopedia of Integer Sequences Identify a sequence by entering few terms in the sequence. Additional information includes examples, formulas, and related links. http://www.research.att.com/~njas/sequences/
PlanetMath A collaborative encyclopaedia with entries contributed under the GNU Free Documentation License. http://planetmath.org/
Platonic Realms Online resource for the mathematics community: links library, bookstore, quotes, and online articles. http://www.mathacademy.com/pr/index.asp
Summation Formulae For polynomials of degrees up to 50, generated using the Euler-Maclaurin method. http://polysum.tripod.com/
Wikipedia: Mathematics Section Free encyclopedia. Cover number systems, different math fields, foundations, history, applications, and famous problems. http://en.wikipedia.org/wiki/Mathematics/