A note on Grundy colorings of central graphs.

A Grundy coloring of a graph G is a proper vertex coloring of G where any vertex x, colored with c(x), has a neighbor of any color 1,2,...,c(x)-1. A central graph G^c is obtained from G by adding an edge between any two non adjacent vertices in G and subdividing any edge of G once. In this note we focus on Grundy colorings of central graphs. We present some bounds related to parameters of G and a Nordhaus-Gaddum inequality. We also determine exact values for the Grundy coloring of some central classical graphs.