Title: The Waldschmidt constant, II. 

Abstract:  We discuss the Waldschmidt constant of ideals that are generated by products of two distinct variables. Each such ideal corresponds to a graph. It turns out that the Waldschmidt constant of the ideal is equal to the fractional chromatic number of the graph. This leads to the new bounds and computations of the Waldschmidt constant.

No prior knowledge of monomial ideals or graph theory is assumed. All concepts will be explained in the talk.