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Questions about the branch of combinatorics called graph theory (not to be used for questions concerning the graph of a function). This tag can be further specialized via using it in combination with more specialized tags such as extremal-graph-theory, spectral-graph-theory, algebraic-graph-theory, topological-graph-theory, random-graphs, graph-colorings and several others.

2 votes
0 answers
104 views

Decomposing a planar graph

Thomassen proved that the vertex set of every planar graph can be decomposed into two sets inducing a 1-degenerate graph and a 2-degenerate graph, respectively (C. Thomassen, Decomposing a planar grap …
6 votes
0 answers
138 views

Counting $K_4$ on two graphs sharing the same vertices

Let $f(G)$ denote the number of $K_4$ in a graph $G$ and $e(G)$ denote the number of edges of $G$. Consider two simple graphs $G_1$ and $G_2$ having the same set $V$ of $n$ vertices and let $H_1(U)$ …
9 votes
2 answers
314 views

Dividing the edges and diagonals of a polygon among disjoint sub-polygons

Let $P$ be a convex $n$-gon ($n$ is odd and $n \geq 5$). Determine the smallest $m$ such that all edges and diagonals of $P$ can be covered by the edges of $m$ convex sub-polygons of $P$ which …