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[几何] 如何把画框挂在两颗钉子上,使得去掉任意一颗钉子,画框都会掉下去?

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hbghlyj posted 2024-11-8 19:37 |Read mode
web.archive.org/web/20210702085716/http://www … m/blog/archives/3930

    答案:如下图。这样缠绕绳子后,画框保证能挂稳,但少了任意一颗钉子都不行。
201011172[1].png

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original poster hbghlyj posted 2024-11-8 19:38
对于任意数量的钉子,这种“一个都不能少”的悬挂方法都是存在的,并且可以利用数学归纳法得到一种构造解。
arxiv.org/pdf/1203.3602

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