'''Calculus''' (that is, the "infinitesimal calculus", see above) is the [[mathematics|mathematical]] subject that studies rates of change of functions. There are two main branches of calculus—[[derivative|differential]] calculus, and [[integral]] calculus. There are subfields of these: single [[variable]] calculus, [[exterior calculus]], and multi [[variable]] calculus. | '''Calculus''' (that is, the "infinitesimal calculus", see above) is the [[mathematics|mathematical]] subject that studies rates of change of functions. There are two main branches of calculus—[[derivative|differential]] calculus, and [[integral]] calculus. There are subfields of these: single [[variable]] calculus, [[exterior calculus]], and multi [[variable]] calculus. |