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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通过计算全测地子流形的基本群，确定了紧正规黎曼对称空间的极大的极大秩全测地子流形的整体分类。

In this paper, the authors give the globally classfication of the maximal totally geodesic submanifolds with maximal rank of normal Riemannian symmetric Spaces by computing the fundamental group.

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按泥石流形成与人类活动的关系分类，有人为泥石流36条，自然泥石流669条。

Classification by the relation between formation and human activities, there are 36 man-made debris flows and 669 nature debris flows.

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