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I have a hard copy of the Princeton Companion to Mathematics and find it incredibly useful -- highly recommended. http://www.amazon.com/Princeton-Companion-Mat

• wuschel 12y ago
  I prefer the Handbook of Mathematics by Bronstein, which is a math reference bible for most science students in Germany. http://www.amazon.com/Handbook-Mathematics-I-N-Bronshtein/dp/3540434917 http://www.amazon.com/Handbook-Mathematics-I-N-Bronshtein/dp...
  • weinzierl 12y ago
    The Bronstein is awesome and it has a fantastic index but I wouldn't call it a dictionary. Moreover it's far from comprehensive regarding to mathematics because it contains mostly topics relevant for engineering, physics and economics. Vieweg Mathematik Lexikon is good, but in German. There must be something similar in English.