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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
1 answer
163 views

Clique number of $k$-critical graphs

A graph $G$ is called a ${\it{k}}$-${\it{critical}}$ graph if $\chi(G)=k$ and for any proper subgraph $H$ of $G$ we have $\chi(H)<k$, where $\chi(G)$ denotes the chromatic number of $G$. The structure …
0 votes
0 answers
39 views

Number of $5^{-}$-neighbors of high-degree vertices in maximal planar graphs

We call a vertex with a degree no more than $k$ a $k^{-}$-vertex and a $k^{+}$-vertex if it has a degree at least $k$. By the discharging method, the researchers in graph theory obtained a series of r …
3 votes
0 answers
337 views

Perfect matching decomposition algorithm for bipartite regular graphs

It is a well-known result that a bipartite graph can be decomposed into edge-disjoint perfect matchings if and only if it is regular. Now here comes the question. Given a bipartite regular graph, is t …