https://doi.org/10.3888/tmj.23-4   Mathematica has many built-in functions for doing research in graph theory. Formerly it was necessary to load the Combinatorica package to access these functions; most are now available within Mathematica itself. This article studies a problem concerning the vertex coloring of graphs using Mathematica by introducing some user-defined functions. Unfriendly Colorings of Graphs … Continue reading Mixing Numbers and Unfriendly Colorings of Graphs