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:
影响因子:
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通讯作者:
J. Czap;Dávid Hudák;T. Madaras
中科院分区:
文献类型:
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作者:
J. Czap;Dávid Hudák;T. Madaras
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.