During the war it-self, Gottfried Leibnitz of Leipzig had perfected the system of infinitesimal calculus.

The logic of ideas is to that of syllogisms as the infinitesimal calculus to common arithmetic; it proves, but at the same time supersedes.

He was always searching after subtleties; all his ideas were problems, and he carried the spirit of the infinitesimal calculus into the management of business.