Mathematics in the Yahoo! Directory

MathWorld
Comprehensive and interactive encyclopedia of mathematical equations, terms, derivations, and more, for students, educators, math enthusiasts, and researchers.
mathworld.wolfram.com
WebMath
Solves math problems online with step-by-step solutions.
www.webmath.org
Goudreau Museum of Mathematics in Art and Science
Seeks to promote and encourage interest in mathematics for everyone. Offers hands-on exhibits and workshops for all age groups.
www.mathmuseum.org
Jim Loy's Mathematics Page
Facts and problems for algebra, geometry, calculus, arithmetic, number theory, and more.
www.jimloy.com/math/math.htm
Math Database
Search through journals from 1931 to the present.
www.emis.de/ZMATH
FAQ - Mathematics
Compilation of Frequently Asked Questions (and their answers) about mathematics. Topics range from the trivial to Wiles' recent proof of Fermat's Last Theorem.
db.uwaterloo.ca/~alopez-o/math-faq/math-faq.html
Math in the Movies
Motion pictures with scenes of real mathematics.
world.std.com/~reinhold/mathmovies.html
Wild Math
Accidentally discovered Trachtenburg's math theories. Some formulae presented and tricks for simple computations.
www.geocities.com/CapeCanaveral/Hangar/8802
Interactive Mathematics Miscellany and Puzzles
Games, puzzles, proofs, facts, and other resources.
www.cut-the-knot.com
Xmorphia
Xmorphia is an X-windows application to show the variety of patterns that may be exhibited by a relatively simple parabolic partial differential equation.
www.ccsf.caltech.edu/ismap/image.html
Mathematical Quotation Server
Collection of quotations about math and mathematicians, from Descartes to Einstein. Search by keyword, browse by author, or view a random quote.
math.furman.edu/~mwoodard/mquot.html
Zipf's Law
Explanation and bibliography.
linkage.rockefeller.edu/wli/zipf
Fast Marching Methods and Level Set Methods
Numerical techniques which can follow the evolution of interfaces. Site contains a general introduction, interactive Java applets, and movies.
www.math.berkeley.edu/~sethian/level_set.html
Good Math, Bad Math
Mark Chu-Carroll's blog dedicated to finding the fun in good math; shredding bad math and squashing the crackpots who espouse it.
goodmath.blogspot.com
Probability Tutorials
Online course on measure theory, lebesgue integration, and probability. Individual lessons are in PDF format.
www.probability.net
Transformations
Colorful exposition of transformations described algebraically, geometrically or arithmetically.
www.alaska.net/~turnip/alg2.html
MGNet
Information related to multigrid, multiscale, and domain decomposition methods: preprints, tutorials, codes, monthly newsletters, and a large BibTex database.
www.mgnet.org
Library of Math
Freely disseminates mathematical information and tutorials.
www.libraryofmath.com
Maths Dictionary for Kids, A
Easy definitions for basic math.
www.teachers.ash.org.au/jeather/maths/dictionary.html
100 Greatest Theorems
The hundred best and most important theorems in mathematics, with information on the mathematician that discovered each one. Browse math classics like "The Irrationality of the Square Root of 2", or brush up on facts about math theorists like Archimedes.
personal.stevens.edu/~nkahl/Top100Theorems.html