Lambda Numbers of Finite $p$-Groups

Mayank Mishra, Siddhartha Sarkar

An $L(2,1)$-labelling of a finite graph $\Gamma$ is a function that assigns integer values to the vertices $V(\Gamma )$ of $\Gamma$ (colouring of $V(\Gamma )$ by $\mathbb{Z}$) so that the absolute dif…