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::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.) Many notable scientists who are able to do calculus are also [[atheists]]. 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]].