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 Understanding Algebra
An online text introducing algebra.
 American Mathematical Society  eMath
 Base Three Computing
 Calculators Online
 Canadian Mathematical Society
Camel
 Chaos at Maryland
University of Maryland
Nonlinear dynamics
 Chaos without the math
 Cornell's Digital Library
571 original math books have been scanned and are available here.
Browse by author or title.
 Dave's Math Tables
 Einstein's Legacy
University of Illinois
From Relativity to spacetime
 Electronic Journal of Qualitative Theory of Differential Equations
"information and coding theory, dynamical systems, logic and the theory of algorithms, statistical inference and prediction.."
 Favorite Mathematical Constants
 Golomb Rulers
 Fractals, Chaos
Excellent place to start learning about these fascinating creations.
 History of Mathematics
 Iterated Prisoner's Dilemma
The gametheory problem with a twist. Also a game for 2; where IPD is found in nature.
 Largest known primes
From introduction to Euclid's proof of the infinitude of primes.
 Math2.org
Math reference tables for K12 to college/university level. Message Board; links to other math sites.
 Mathematical Art of M.C. Escher
 Maths: A Student's Survival Guide
A SelfHelp Workbook for Science and Engineering Students by Jenny Olive
 Mersenne Primes Homepage
 Mrs. Glosser's Math Goodies

The Net's Most Outrageous Number Crunchers [Thanks to Jennifer]
A metasite of various resources to crunch numbers in various ways, from chords to a carbon footprint calculator
 Netlib
".. a collection of mathematical software, papers, and databases."
 Pacific Journal of Mathematics
Online version of this journal.
 Patterns
Three sites that cover the gamut of patterns.
 Number Patterns Fun with Curves & Topology
*Very* comprehensive metasite of links covering:
Prime numbers & magic squares; modular arithmetic; the Golden Ratio; Fibonacci numbers; binary numbers; Pascal's Triangle; the Conics; Moire patterns;
curve stitching; my favourite: Curves of constant width  the famous Reuleaux triangle; cycloids; fractals; topology;
mazes, networks, map colouring; knots and string figures; flexagons; optical illusions; miscellaneous diversions.
 Symmetry and Tessellations
 Polyhedra Pastimes
 Perfect, amicable, and sociable numbers
Aliqout sequences; definitions of divisibility.
 Prime Curios!
This site is dedicated to prime numbers and their curiosities.
 QuickMath
Free online calculator solves common algebra and calculus problems using Mathematica
 Rolling with Reuleaux
A curve of constant width, this simple imaginative shape is used to bore square holes, and is the basis
for the Wankel engine.
 Second Moment
"..a metasite for statistical and analytical research and applications."
 Sloan's Online Encyclopedia of Integer Sequences
Comprehensive, searchable database of integer sequences and patterns.
 SOS Mathematics
Tables, forumulae, constants, conversion units covering several mathematical disciplines.
 Statistics every writer should know about
How numbers can be used to misinform.
 Statistics Homepage
A very comprehensive site covering basic to advanced statistics. Glossary too!
 Topology Atlas
All things topological.
 Unsolved Mathematics Problems
 Wizard of Odds
Gambling: myths and facts; strategies; rules; etiquette.
 The Zero Saga
A site dedicated to zero!