2 problems

Fix an integer $\ell\geq 0$. Let $e_\ell(n)$ denote the maximum number of edges in a subgraph of $D_n$ with local crossing number $\ell$, and let $C_\ell$ be the coefficient define…

Let $D_n$ be the graph under consideration, let $e_\ell(n)$ denote the maximum number of edges in a subgraph of $D_n$ with local crossing number $\ell$, and call an edge crossing f…