圈的路联图的Cordial性

利用剖分法,将含多个顶点的圈的路联图转化为仅含3,4,5,6个顶点的圈的路联图,并结合任意cordial图G路联Ci(i=3,4,5,6)是cordial图和Ci路联Cj(i,j=3,4,5,6)是cordial图两个结论,证明了具有不同顶点数的多个圈构成的路联图和树联图均是cordial图,所得结论推广了之前已有的结论.而剖分法是研究圈的标号的一种有效的方法.

关于路联图的Cordial性推广

当n≥2,mi≥3（i=1,2,…,n）,圈的路联图P（Cm1,Cm2,…,Cmn）与树联图T（Cm1,Cm2,…,Cmn）均是cordial图。

A Daunting Task

On December 18,2015,the UN Security Council unanimously adopted a roadmap for a peace process in Syria,which was seen as having injected＂fresh impetus＂to solve the Syrian crisis.The UN Security Council Resolution 2254requires a nationwide ceasefire in Syria within January 2016 and the convening of formal Syrian-led and transition-focused negotiations in the same month between the Bashar al-Assadled government and opposition members.