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Two of them also use emphasis to make the meaning clearer. The last example is a popular example of a double negative that resolves to a positive. This is because the verb 'to doubt' has no intensifier which effectively resolves a sentence to a positive. Had we added an adverb thus: I never had no doubt this sentence is false.
In propositional logic, the double negation of a statement states that "it is not the case that the statement is not true". In classical logic, every statement is logically equivalent to its double negation, but this is not true in intuitionistic logic; this can be expressed by the formula A ≡ ~(~A) where the sign ≡ expresses logical equivalence and the sign ~ expresses negation.
In C (and some other languages descended from C), double negation (!!x) is used as an idiom to convert x to a canonical Boolean, ie. an integer with a value of either 0 or 1 and no other. Although any integer other than 0 is logically true in C and 1 is not special in this regard, it is sometimes important to ensure that a canonical value is ...
An example is Japanese, which conjugates verbs in the negative after adding the suffix -nai (indicating negation), e.g. taberu ("eat") and tabenai ("do not eat"). It could be argued that English has joined the ranks of these languages, since negation requires the use of an auxiliary verb and a distinct syntax in most cases; the form of the ...
For example, anywhere is an NPI corresponding to the negative nowhere, as used in the following sentences: I was going nowhere. (the negative nowhere is used when not preceded by another negative) I was not going anywhere. (the NPI anywhere is used in the environment of the preceding negative not)
Auxiliaries in African American Vernacular English are related in a typical pattern. They can be grouped into negative forms and affirmative forms for each of the words. For example, "had" is an affirmative form, while "hatn" is the corresponding negative form. These same auxiliaries can be used to mark sentences for the anterior aspect.
An example is the "double-negative" in: "Nobody never lifted a finger to help her." Expletive negation is a standard usage in Old English , and in Middle English , as in this sentence, where, from a modern perspective, "not" and the negative marker "ne" seem to be not required: [ 18 ] [ 19 ]
In rhetoric, litotes (/ l aɪ ˈ t oʊ t iː z, ˈ l aɪ t ə t iː z /, US: / ˈ l ɪ t ə t iː z /), [1] also known classically as antenantiosis or moderatour, is a figure of speech and form of irony in which understatement is used to emphasize a point by stating a negative to further affirm a positive, often incorporating double negatives for effect.