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• Canadian Mathematical Society (Camel)

  Publications, activities, resources, links

   

• Mathematical Programming Glossary

  "This contains terms specific to mathematical programming, and some terms from other disciplines, notably economics, computer science, and mathematics, that are directly related." Search by alphabetical index. The author of the site is a professor at the University of Colorado (Denver).
   

   

• MathWorld

"MathWorld is a comprehensive and interactive mathematics encyclopedia intended for students, educators, math enthusiasts, and researchers."  An alphabetical index gives access to several subjects as algebra, applied mathematics, calculus and analysis, discrete mathematics, foundations of mathematics, geometry, history and terminology, number theory, probability and statistics, recreational mathematics and topology.

• Plouffe's Inverter

"This server is a database of more than 215,000,000 mathematical constants like Pi, E, Catalan or Euler-Mascheroni constant with more than 2 billion digits."