# Diameter of a disconnected graph

Given G(V,E) a graph that has 2 connected components, what is the diamter of this graph?

The distance $$d_G(u,v)$$ between two disconnected vertices $$u,v$$ of a graph is usually defined as $$+\infty$$.
As a consequence the diameter of a disconnected graph $$G=(V,E)$$ is $$\textrm{diam}(G) = \max_{u,v \in V} d_G(u,v) = + \infty.$$