Abstract
This is the research project for Jie Han's postdoctoral fellowship at the Institute of Mathematics and Statistics of the University of São Paulo (IME/USP). This researcher will be a member of the combinatorics and theory group of IME/USP, and he wil also be a member of NUMEC, Núcleo de Modelagem Estocástica e Complexidade, a research centre of the University of São Paulo.We propose to in…