Using this result we prove in this paper that every contractible polyhedron is an absolute retract.

借助于这一结果，本文证明了每一个可缩多面体均是个绝对收缩核。

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An edge of a 6 connected graph is said to be 6-contractible if its contraction results still in a 6 connected graph.

如果6连通图的一条边收缩后使得所得到的图仍是6连通，则这条边称为6可收缩边。

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This paper presents a survey on the properties and distributions of contractible edges and removable edges in 3 connected graphs.

综述了3连通图中可缩边和可去边的性质以及它们在图中的分布情形。

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