A one-dimensional Whitney trick and Kuratowski’s graph planarity criterion

A one-dimensional Whitney trick and Kuratowski’s graph planarity criterion
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一维 Whitney 技巧和 Kuratowski 的图平面性准则

DOI:
10.1007/bf02773426
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发表时间:
1991
影响因子:
1
通讯作者:
K. S. Sarkaria
K. S. Sarkaria
中科院分区:
数学2区
文献类型:
--
作者:
K. S. Sarkaria

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当n ≥3时,普通的Whitney技巧证明了一个具有货车坎彭阻塞类0(kn)=0的单纯复形Knn嵌入R2n.我们给出了一维的Whitney技巧,利用它,任何满足ingo(K1)=0的图K1都可以逐步嵌入到R2中。然后,我们推导出一些其他的平面性标准,包括库拉托夫斯基的,从这个结果。作为一个副产品,我们还获得了一个迷人的描述模2同源的删除产品的图。
Forn≥3, the ordinary Whitney trick shows that a simplicial complexKnhaving van Kampen obstruction classo(kn)=0 embeds inR2n. We give a one-dimensional version of the Whitney trick, by means of which any graphK1satisfyingo(K1)=0 can be, step by step, embedded inR2. We then deduce some other planarity criteria, including Kuratowski’s, from this result. As a byproduct we also obtain a fascinating description of the mod 2 homology of the deleted product of a graph.