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Syntax
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Logical constants: true, false
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Propositional symbols: P, Q, S, ...
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Wrapping parentheses: ( … )
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Atomic formulas: Propositional Symbols or logical constants
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Formulas are either atomic formulas, or can be formed by combining atomic formulas with the following connectives:
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∧ ...and [conjunction]
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∨ ...or [disjunction]
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→...implies [implication / conditional]
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↔ ...is equivalent [biconditional]
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¬ ...not [negation]
