(Translated by https://www.hiragana.jp/)
The Wayback Machine - http://web.archive.org/web/20121014103447/http://planetmath.org:80/browse/objects/?tags=on;Reference=1;Recreation=1;Exercises=1;Collaborations=1;Research=1;Education=1
PlanetMath
PlanetMath
Math for the people, by the people

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