Disjunction introduction is a rule in natural deduction that allows one to infer a disjunction from a single statement. This rule states that if a proposition 'P' is true, then the compound statement 'P or Q' (symbolically represented as 'P ∨ Q') is also true, regardless of the truth value of 'Q'. This concept is essential for constructing arguments and proofs by enabling the introduction of alternatives based on established truths.
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