Changes

::The word "calculus" has historically had a much more general meaning than at present.  It means "a method or 'trick' for calculating something".  (The word means "little stone" in Latin, referring to the use of pebbles for counting.)  Among the types of calculus are:

::The word "calculus" has historically had a much more general meaning than at present.  It means "a method or 'trick' for calculating something".  (The word means "little stone" in Latin, referring to the use of pebbles for counting.)  Among the types of calculus are:

:::*'''Propositional calculus'''—a notation for proving theorems about logical expressions.

:::*'''[[Propositional calculus]]'''—a notation for proving theorems about logical expressions.

:::*'''Predicate calculus'''—a notation for proving theorems about functions in [[set theory]].

:::*'''Predicate calculus'''—a notation for proving theorems about functions in [[set theory]].

:::*'''Lambda calculus'''—a notation for proving theorems about recursive functions and computability in [[computer science]].

:::*'''Lambda calculus'''—a notation for proving theorems about recursive functions and computability in [[computer science]].

:::*and, of course, '''Differential''' and '''Integral''' calculus—the common modern meaning of the term, and the subject of this article.  These two forms are sometimes collectively called '''infinitesimal calculus'''.

:::*and, of course, '''Differential''' and '''Integral''' calculus—the common modern meaning of the term, and the subject of this article.  These two forms are sometimes collectively called '''infinitesimal calculus'''.

'''Calculus''' 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.

Calculus has numerous applications in many fields, such as [[engineering]], [[physics]], [[chemistry]], [[biology]], and [[economics]].  Many physical properties can be explained and/or modeled through the use of calculus.

Calculus has numerous applications in many fields, such as [[engineering]], [[physics]], [[chemistry]], [[biology]], and [[economics]].  Many physical properties can be explained and/or modeled through the use of calculus.