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tautology |
Also found in: Dictionary/thesaurus, Legal, Wikipedia, Hutchinson | 0.03 sec. |
tautologyIn logic, a statement that cannot be denied without inconsistency. Thus, “All bachelors are either male or not male” is held to assert, with regard to anything whatsoever that is a bachelor, that it is male or it is not male. In the propositional calculus, even complicated symbolic expressions such as [(A ⊃ B) ∧ (C ⊃ ¬ B)] ⊃ (C ⊃ ¬ A) can be shown to be tautologies by displaying in a truth table every possible combination of T (true) and F (false) of its arguments A, B, C. A tautology can be purely formal (a statement form rather than a statement), and in some usages only such formal truths are tautologies. tautology Logic a statement that is always true, esp a truth-functional expression that takes the value true for all combinations of values of its components, as in either the sun is out or the sun is not out
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The declaration itself, though it may be chargeable with tautology or redundancy, is at least perfectly harmless. Methodical, or well arranged, or very well delivered, it could not be expected to be; but it contained, when separated from all the feebleness and tautology of the narration, a substance to sink her spirit especially with the corroborating circumstances, which her own memory brought in favour of Mr. I had said the same thing over and over again to see whether the wilful tautology would cause the secretary to open his eyes. |
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