Abstract
The edges and faces of a plane graph are colored so that every two adjacent or incident of them are
colored differently. The minimal number of colors for this kind of coloring is estimated. For the
plane graphs of the maximal degree at least 10, the bound is the best possible. The proof is based on
some new generalizations of Kotzig’s Theorem on the minimal weight of edges in plane graphs.
Another tool is the concept of assigned coloring (choosability).