In logic and mathematics, a propositional calculus (or a sentential calculus) is a formal system in which formulae representing propositions can be formed by combining atomic propositions using logical connectives, and a system of formal proof rules allows certain formulæ to be established as "theorems".

Reference:
http://en.wikipedia.org/wiki/Propositional_logic

Posted by 알 수 없는 사용자
,