A simple example of a differential logical calculus is furnished by '''differential propositional calculus'''. This augments ordinary [[propositional calculus]] in the same way that the [[differential calculus]] of [[Leibniz]] and [[Newton]] augments the [[analytic geometry]] of [[Descartes]]. | A simple example of a differential logical calculus is furnished by '''differential propositional calculus'''. This augments ordinary [[propositional calculus]] in the same way that the [[differential calculus]] of [[Leibniz]] and [[Newton]] augments the [[analytic geometry]] of [[Descartes]]. |