New posts in Coloring

Every point of a grid is colored in blue, red or green. How to prove there is a monochromatic rectangle?

Coloring the pentagonal hexecontahedron

Find an example of a regular triangle-free $4$-chromatic graph

If G is a graph such that $\Delta(G) = 3$ then $\chi'(G) \le 4$

Monochromatic squares in a colored plane

Graph theory: Prove $k$-regular graph $\#V$ = odd, $\chi'(G)> k$

When chessboards meet dominoes

Edge coloring of the cube

How is the graph coloring problem NP-Complete?