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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.

8 votes
1 answer
840 views

Total chromatic number and bipartite graphs

I'm looking for a proof to the following statement: Let G be a simple connected graph If $\chi''(G)=\chi'(G)+\chi(G)$ holds then the graph should be bipartite, where $\chi''(G)$ is the total chroma …
3 votes
1 answer
182 views

Primes and ihara zeta function on graphs

The ihara zeta function of a graph $X$ is defined as $$\zeta_X(u)=\prod_{ [C] }(1-u^{v(C)})$$ where the product is over the primes of the graph( A.Terras Zeta functions of graphs a stroll through the …
4 votes
1 answer
298 views

Ihara zeta and chromatic number of graphs

1)Do two graphs with the same Ihara Zeta function have the same chromatic number? What about the Stark and Terras edge zeta function? i am searching for counterexamples too. 2) What is the relation be …