Planar dual graph
= Planar dual graph
A planar dual graph has one vertex in each face of a fixed planar embedding and one dual edge crossing each primal edge.
This is the planar-embedding case of a <dual graph>.
= Planar dual graph
A planar dual graph has one vertex in each face of a fixed planar embedding and one dual edge crossing each primal edge.
This is the planar-embedding case of a <dual graph>.