-- Prof. Laura Gardini laura.gardini@uniurb.it Full professor of Mathematics for Economics Department of Economics and Quantitative Methods University of Urbino, Via A. Saffi n.42, 61029 Urbino - Italy http://www.econ.uniurb.it/gardini/gardiniweb.htm tel. (Univ. Institute) (+39) 0722 305510 tel. (Univ. direct) (+39) 0722 305568 fax. (Univ.) (+39) 0722 305550 tel. (home) (+39) 0722 580539