Tautology
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Look up tautology in Wiktionary, the free dictionary. |
Tautology may refer to:
- Tautology (rhetoric), using different words to say the same thing even if the repetition does not provide clarity. Tautology also means a series of self-reinforcing statements that cannot be disproved because the statements depend on the assumption that they are already correct.
- Tautology (logic), a technical notion in formal logic, universal unconditioned truth, always valid.
- Tautology (rule of inference), a rule of replacement for logical expressions in some systems of propositional logic.
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