PISCATAWAY, N.J. - A small group of thinking men and women convened at Rutgers University last month to consider how order theory — a branch of abstract mathematics that deals with hierarchical relationships — could be applied to the war on terror. It almost seems ridiculous for people who inhabit a world of concept lattices and partially ordered sets to think they can affect a war that is being fought on the streets of Baghdad and in the remote mountains of northern Pakistan. But the war on terror is also fought in cyberspace, and in the minds of people from...