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1972年12月1日

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数学游戏，1972年12月

关于双孔环面的棘手问题，以及上个月密码的解答

作者：马丁·加德纳

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This article was originally published with the title “Mathematical Games” in 大众科学 Magazine Vol. 227 No. 6 (December 1972), p. 102
doi:10.1038/scientificamerican1272-102

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