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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