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3 个月
像球但又不是球?困扰数学界 30 年的“非常基本的问题”终破解
则包裹住正三角形的三段圆弧围成的图形,就是一条非圆定宽曲线。实际上,它是除圆之外最简单和最著名的定宽曲线:Reuleaux 三角形。 因为它的 ...
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