Examlex
Which figure best approximates the number of Americans for whom English is a second language?
Negation
The contradiction or denial of something, often expressed in linguistic terms as "not."
Bi-conditional
A logical connection between two statements where both are true or both are false.
Tautology
A statement that is true by necessity or by virtue of its logical form, often repeating the same idea in different words.
Self-contradictory
A statement or position that contradicts itself, making it logically impossible or nonsensical.
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