Zhihong Jeff Xia
Arthur and Gladys Pancoe Professor of mathematics
Department of Mathematics
Evanston, IL 60208-2730
xia at math.northwestern.edu
The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful. If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living.- Henri Poincaré.