Tautology is the use of different words to say the same thing twice in the same statement. `The money should be adequate enough' is an example of tautology. tautologies a statement in which you say the same thing twice using different words in a way which is not necessary, for example, 'He sat alone by himself.' redundant tautologous. In 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
useless repetition; "to say that something is `adequate enough' is a tautology" (logic) a statement that is necessarily true; "the statement `he is brave or he is not brave' is a tautology
A non-atomic, or molecular, proposition that is true no matter what the assignment of truth value to the atomic propositions that it contains Example: "p or not-p" This molecular proposition is true whether we assign "p" the value true or the value false
repetition of an idea in different words "With malice toward none, with charity for all " -- Abraham Lincoln
(logic) a statement that is necessarily true; "the statement `he is brave or he is not brave' is a tautology
\Tau*tol"o*gy\, n A needless repetition of the same meaning in different words or phrases; a representation of anything as the cause, condition, or consequence of itself; repetition; redundancy
the saying of the same thing twice over in different words a statement in which the predicate asserts no more than is contained in the meaning of the subject an instance of a valid formula of propositional logic a complex proposition which is true independently of the truth values of its constituent atomic propositions a statement that is necessarily true an analytic statement
The unnecessary and excessive repetition of the same idea in different words in the same sentence, as "The room was completely dark and had no illumination," or "A breeze greeted the dusk and nightfall was heralded by a gentle wind " (Compare Pleonasm)
A logical statement in which the conclusion is equivalent to the premise If p is a tautology, it is written A sentence whose truth table contains only `T' is called a tautology
(logic) a statement that is necessarily true; "the statement `he is brave or he is not brave' is a tautology"
use of an extra word in a phrase or sentence which unnecessarily repeats an idea, e g the annual poetry festival is staged every year
A repetition of the same meaning in different words; needless repetition of an idea in different words or phrases; a representation of anything as the cause, condition, or consequence of itself, as in the following lines: The dawn is overcast, the morning lowers, And heavily in clouds brings on the day
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