洛阳师范学院学报
洛暘師範學院學報
락양사범학원학보
Journal of Luoyang Teachers College
2013年
2期
7~10
,共null页
图 联图 边着色 边色数
圖 聯圖 邊著色 邊色數
도 련도 변착색 변색수
graph; join graph ; edge-coloring; chromatic index
两个不交图G与H的联G+H是指顶点集为V(G)UV(H),边集为E(G)LIE(H)U{xy|x∈V(G),y∈V(H)}的图.证明了当n=m+1时,联图Om+Cn是第二类图,否则,Om+Cn是第一类图;当|n—m|=1时,联图Cm+Cn是第二类图,否则,Cm+Cn是第一类图.
兩箇不交圖G與H的聯G+H是指頂點集為V(G)UV(H),邊集為E(G)LIE(H)U{xy|x∈V(G),y∈V(H)}的圖.證明瞭噹n=m+1時,聯圖Om+Cn是第二類圖,否則,Om+Cn是第一類圖;噹|n—m|=1時,聯圖Cm+Cn是第二類圖,否則,Cm+Cn是第一類圖.
량개불교도G여H적련G+H시지정점집위V(G)UV(H),변집위E(G)LIE(H)U{xy|x∈V(G),y∈V(H)}적도.증명료당n=m+1시,련도Om+Cn시제이류도,부칙,Om+Cn시제일류도;당|n—m|=1시,련도Cm+Cn시제이류도,부칙,Cm+Cn시제일류도.
The join G + Hof two disjoint graphs G and H is the graph having vertex set V(G) U V(H) and edge set E(G) U E(H) U {xy |x ∈ V(G) ,y ∈ V(H) }. In this paper we prove that ifn = m + 1 , then the join graph Om + Cn is class two, the rest is class one ; if | n - m | = 1 , then the join graph Cm + Cn is class two, the rest is class one.