(Translated by https://www.hiragana.jp/)
The Wayback Machine - http://web.archive.org/web/20120927204749/http://planetmath.org/browse/objects/17-XX/?tags=NS:Section:Reference,NS:Section:Research,NS:Section:Recreation,NS:Section:Education,NS:Section:Exercise,NS:Collaboration&ns=msc
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Math for the people, by the people

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