Extremal number
= Extremal number
{title2=$\operatorname{ex}(n,H)$}
The extremal number $\operatorname{ex}(n,H)$ is the largest number of edges in an $n$-vertex graph containing no subgraph isomorphic to $H$.
= Extremal number
{title2=$\operatorname{ex}(n,H)$}
The extremal number $\operatorname{ex}(n,H)$ is the largest number of edges in an $n$-vertex graph containing no subgraph isomorphic to $H$.