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Definitioner
Substantiv
- (uncountable) redundant use of words
- (countable) An expression that features tautology.
- (countable, logic) A statement that is true for all values of its variables
Exempel
- It is tautology to say, "Forward Planning".
- The expression "raze to the ground" is a tautology, since the word "raze" includes the notion "to the ground".
- Pure mathematics consists of tautologies, analogous to ‘men are men’, but usually more complicated.
- Given a Boolean A, "A OR (NOT A)" is a tautology.
- A logical statement which is neither a tautology nor a contradiction is a contingency.
- A tautology can be verified by constructing a truth tree for its negation: if all of the leaf nodes of such truth tree end in X's, then the original (pre-negated) formula is a tautology.
Böjningsformer