Apex graph
Материал из WikiGrapp
Apex graph — вершинный (или апексный) граф.
An apex graph is a graph [math]\displaystyle{ \,G }[/math] that has a vertex [math]\displaystyle{ v \in V(G) }[/math] such that [math]\displaystyle{ G \setminus \{v\} }[/math] is planar.