Who are the four main people responsible for creating calculus? What contributions did each of them make?

Here are 4 of my favorites:





Newton - responsible for developing the original calculus; used it to solve physics problems





Riemann - defined integration





Leibniz - developed a lot of the notation





L'hopital - related taking limits of indeterminate forms to differentiationWho are the four main people responsible for creating calculus? What contributions did each of them make?
Newton and Liebniz are the one's you always hear about. They supposedly each discovered the fundamental theorem of calculus independently, althought there is some controversy surrounding the matter.





As for two others- it is hard to say. Since I noticed that the other answer mentioned l'Hopital, here's an interesting bit of trivia about him. The well known rule in calculus for evaluating limits called ';l'Hopital's rule'; was actually discovered by Bernoulli. In fact l'Hopital and Bernoulli had a deal in which l'Hopital paid to have Bernoulli tell l'Hopital of his discoveries, which l'Hopital would then write about.