Incidence (graph)

In graph theory, a vertex is incident with an edge if the vertex is one of the two vertices the edge connects.

An incidence is a pair $(u,e)$ where $u$ is a vertex and $e$ is an edge incident with $u$ .

Two distinct incidences $(u,e)$ and $(v,f)$ are adjacent if and only if $u=v$ , $e=f$ or $uv=e$ or $f$ .

An incidence coloring of a graph $G$ is an assignment of a color to each incidence of G in such a way that adjacent incidences get distinct colors. It is equivalent to a strong edge coloring of the graph obtained by subdivising each edge of $G$ once.

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