Tautologies and contradictions: Revision history

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20 October 2025

  • curprev 14:3214:32, 20 October 2025‎ Bfh-sts talk contribs‎ 1,234 bytes +1,234‎ Created page with "= Tautologies and contradictions = Tautologies and contradictions are special types of logical formulas that are always true or always false, regardless of the truth values of their components. == Tautologies == A tautology is a statement that evaluates to true under all possible interpretations. Tautologies are useful in proofs and as logical identities. === Examples === * p ∨ ¬p (Law of excluded middle) * (p → q) ∨ (q → p) * (p ∨ q) → (q ∨ p)..."
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