The plural of calculus is generally "calculi." The word "calculuses" is also a plural, but very rare.
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Predicate calculus is the axiomatic form of predicate logic.
No, not really. Calculus uses algebra to solve equations, but calculus is a branch of mathematics all its own.
Brushing and flossing can remove plaque which causes calculus to form. But once calculus does form, it is too hard and firmly attached to be removed with a toothbrush. dental visits are necessary so that calculus build up can be professionally removed with sharp instruments. Source: i am a dentist
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Calculus; by a long shot.