First-Fit Coloring of Forests in Random Arrival Model

We consider a graph coloring algorithm that processes vertices in order taken uniformly at random and assigns colors to them using First-Fit strategy. We show that this algorithm uses, in expectation, at most (1/2 + o(1))· ln n \,/\, lnln n different colors to color any forest with n vertices. We also construct a family of forests that shows that this bound is best possible.