L(2,1)-labelling of Circular-arc Graph

Satyabrata Paul, Madhumangal Pal, Anita Pal

An L(2,1)-labelling of a graph $G=(V,E)$ is ${\lambda }_{2,1}(G)$ a function $f$ from the vertex set V (G) to the set of non-negative integers such that adjacent vertices get numbers at le…