logical calculus
Also called a formal language, and a logistic system. A system in which explicit rules are provided for determining (a) which are the expressions of the system; (b) which sequences of expressions count as well formed ( well-formed formulae, or wffs); (c) which sequences of wffs count as proofs . A system may contain axioms, and a wff that terminates a proof will be a theorem . The two most famous calculi are the propositional calculus and the predicate calculus.

Philosophy dictionary. . 2011.

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