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U of T Mathematics Network
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This is the place to stretch your brain. In the interactive activities sections, play games against the computer, test crazy proofs, or work out a traffic flow problem. The problems and puzzles section links you to other problem sites and enables you to enter an international math talent search. The network has an excellent list of links to related sites and a good print bibliography. Start at the highlights section if you are overwhelmed by the options at this site.
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University of Toronto
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Indexes and Resource Lists, Math
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