图G的一个k-(2,1).全标号是一个映射f:V(G)UE(G)→(0.1,…,k),使得任意2个相邻的点和相邻的边有不同值,且任一对相关联的点和边的值差的绝对值至少为2.G的(2,1)一全标号数λ2'(G)定义为G有一个k-(2,1).全标号的最小的k值.刻画了圈与圈、路与路笛卡尔积图的(2,1)-全标号数.
The (2,1)-total labelling number ),λ2’ (G) of a graph G is the width of the smallest range of integers that suffices to label the vertices and edges of G such that no two adjacent vertices or two adja- cent edges have the same labels and the difference between the labels of a vertex and its incident edges is at least 2. A complete characterization for the (2,1)-total labelling numbers of the Cartesian product of two cycles and the Cartesian product of two paths was given.