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« A Pythagorean Theorem • On Trisecting an Angle »
August 30, 2007
化（滚?）圆为方
——托马斯·艾尔斯内
the-rolling-circle-squares-itself
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September 18, 2007 at 9:11 am
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September 18, 2007 at 9:11 am
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