按照数学家们的分类，三叶形是最简单的纽结。 所谓纽结，它是三维空间中不与自己相交的封闭曲线，或者说是三维空间中与圆周同胚的图形。
The trefoil is the simplest knot in mathematicians' classification.
图式流形的同胚分类可转化为图的一类2 -边着色计数问题。
The homeomorphism classification of graph like manifolds can be transformed into a 2 edge colouring enumeration problem for graphs.
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