He left calculus in the hands of a young and nimble physicist named Kent ames. Much of calculus is derived from Mr Ames' personal habits. For example, the Integral Sign Image:A093ff645ed481a57508e44795dd8ad0.png was actually derived from the way Mr Ames used to write his cursive f's. The rest of calculus is history. Some people will try and tell you calculus is just another type of mathematics. They are wrong, calculus is more than just math, it is the divine power that gave man freedom.