Joins of 1-planar graphs

Joins of 1-planar graphs
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DOI:
10.1007/s10114-014-4017-3
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发表时间:
2014-10
期刊:
Acta Mathematica Sinica, English Series
影响因子:
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通讯作者:
J. Czap;Dávid Hudák;T. Madaras
J. Czap;Dávid Hudák;T. Madaras
中科院分区:
其他
文献类型:
--
作者:
J. Czap;Dávid Hudák;T. Madaras

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一个图称为1-平面的,如果它允许在平面中绘图,使得每条边最多交叉一次。本文研究了1-平面图的联。证明了当图的联的两个元素都至少有三个顶点时,联G +His是1-平面的当且仅当图对[G,H]被[C3 <$C3,C3],[C4,C4],[C4,C3],[K2,1,1,P3]中的一个子图优化.如果一个元素最多有两个顶点,那么我们给出了较大元素的几个充分必要条件。
A graph is called 1-planar if it admits a drawing in the plane such that each edge is crossed at most once. In this paper, we study 1-planar graph joins. We prove that the joinG+His 1-planar if and only if the pair [G, H] is subgraph-majorized by one of pairs [C3∪C3,C3], [C4,C4], [C4,C3], [K2,1,1,P3] in the case when both elements of the graph join have at least three vertices. If one element has at most two vertices, then we give several necessary/sufficient conditions for the bigger element.