((欧拉图的可收缩边-正则))

A. A. Sangoor
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摘要

本文定义了可缩边欧拉图,设为一类欧拉图,其中的边e称为可缩边欧拉图。引入了欧拉图具有可缩边欧拉图的必要条件,进一步研究了奇偶可缩边欧拉图,并定义了可缩边欧拉图类,其中G中的边e满足缩边性质,称为可缩边欧拉图。Tutte[7]证明了每一个非同构的3连通图都具有3可缩性,并证明了每一个超过4个顶点的3连通图都包含一条边,该边的收缩产生一个新的3连通图[7]。证明了图G是非同构的欧拉图具有可收缩边。如何在每个至少有7个顶点的4连通图上,通过随后收缩一条或两条边,将其缩减为更小的4连通图[7]。同时讨论了图G是欧拉图,在至少7个顶点上可以收缩,保存了欧拉图的性质。设一个正则图和欧拉图,如果是正则欧拉图,则称其边e为可收缩正则欧拉图,讨论了欧拉图的收缩关系,如果有可收缩正则欧拉图,则无可收缩正则欧拉图。
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((Contractible Edge of Eulerian Graph- Regular ))
In this paper define the contractible edge eulerian graph that, let  is a class of  Eulerian graphs , the edge e in   is called contractible edge eulerian graph if . The necessary  conditions for Eulerian graphs to have contractible edge eulerian have been introduced, further, the even and odd contractible edge eulerian graph have been studied , we also define the contractible edge eulerian graph class,  the  edge e in G is satisfied property contraction is called contractible edge eulerian if . Tutte [7] proved every 3-connected graph non isomorphic to  have 3-contractible and proved every 3-connected graph on more than four vertices contains an edge whose contraction yield a new 3-connected graph [7]. We proved graph G is eulerian graph has contractible edge if non isomorphic to . How over every 4-connected graph on at least seven vertices can be reduced to smaller 4-connected graph by contraction one or two edge subsequently [7]. Also we discussed the graph G is eulerian on at least seven vertices can be contraction and saved the properties of eulerian graph.  Let  be a regular graph and eulerian graph, the edges e in   is called contractible regular-eulerian graph if  is regular-eulerian grah, We discussed relation contraction of eulerian-regular graph then  has contractible if  if  then  has not contractible regular-eulerian.
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