![Propositional calculus / Semantics / Boolean algebra / Logical connective / Truth table / Valuation / If and only if / Tautology / Natural deduction / Abstract algebra / Logic / Mathematics Propositional calculus / Semantics / Boolean algebra / Logical connective / Truth table / Valuation / If and only if / Tautology / Natural deduction / Abstract algebra / Logic / Mathematics](https://www.pdfsearch.io/img/b07ab012ed134cf417d8a1632c2af23b.jpg) Propositional calculus Semantics Boolean algebra Logical connective Truth table Valuation If and only if Tautology Natural deduction Abstract algebra Logic Mathematics | | Three-Valued Logics Notation: p, q, r atomic formulas; A, B, C arbitrary formulas Values = {T, F, N} Valuation = assignment of a value from Values to each atomic formula Can be extended to an assignment of values to each
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