Classification of nonorientable regular embeddings of complete bipartite graphs

Classification of nonorientable regular embeddings of complete bipartite graphs
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DOI:
10.1016/j.jctb.2011.03.003
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发表时间:
2010-01
期刊:
J. Comb. Theory, Ser. B
影响因子:
--
通讯作者:
J. Kwak;Young Soo Kwon
J. Kwak;Young Soo Kwon
中科院分区:
其他
文献类型:
--
作者:
J. Kwak;Young Soo Kwon

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一个图G到一个闭(可定向或不可定向)曲面的2-胞嵌入称为正则的,如果它的自同构群正则地作用在标志-相互关联的点-边-面三元组上。本文将完全二部图Kn,n的正则嵌入分类为不可定向曲面。只有当n的形式为[公式:见正文],其中π是素数全等于±1 mod 8时,Kn,n的这种正则嵌入才存在。在这种情况下,直到同构,Kn的那些正则嵌入的数目为2k。
A 2-cell embedding of a graph G into a closed (orientable or nonorientable) surface is called regular if its automorphism group acts regularly on the flags – mutually incident vertex–edge–face triples. In this paper, we classify the regular embeddings of complete bipartite graphs Kn,ninto nonorientable surfaces. Such a regular embedding of Kn,nexists only when n is of the form [Formula: see text] where the piare primes congruent to ±1 mod 8. In this case, up to isomorphism the number of those regular embeddings of Kn,nis 2k.