Definition:Null Graph/Also defined as

Null Graph: Also defined as

Some treatments of graph theory do not recognise the null graph as a graph at all, requiring that the vertex set of a graph be non-empty.

Hence the term null graph is frequently seen to mean what $\mathsf{Pr} \infty \mathsf{fWiki}$ calls an edgeless graph.

Sources

• Weisstein, Eric W. "Null Graph." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NullGraph.html