A method for mosaicing broken objects based on fractured faces matching is presented. Directed feature vectors and undirected feature vectors used in surface matching are consisted of directed footprints and undirected footprints respectively.
分别用曲面上点的有向脚标和无向脚标构成有向特征向量和无向特征向量,在无向特征向量匹配的基础上,经过匹配点方向映射方法判断其它无向特征匹配点对的有向特征向量的相似性,完成断裂面匹配计算。
参考来源 - 基于断裂面匹配的破碎物体拼接技术·2,447,543篇论文数据，部分数据来源于NoteExpress
但是，哪种具有四肢的近亲及其特征导致了向无四肢的蛇的进化呢？
But which four-legged relatives and their family traits led the transition for legless snakes?
推导出由特征多项式的系数表示的线图（无重边图）中圈的个数，双向结点对个数，单向结点对个数及简单图中有向三角形个数的计算公式，等等。
The formulae for the number of loops, edges, triangles, pairs of two-way nodes and pairs of one-way nodes are deduced by the coefficients of a characteristic polynomial, so on.
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