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  2. Double negative - Wikipedia

    en.wikipedia.org/wiki/Double_negative

    A double negative is a construction occurring when two forms of grammatical negation are used in the same sentence. This is typically used to convey a different shade of meaning from a strictly positive sentence ("You're not unattractive" vs "You're attractive").

  3. Two wrongs don't make a right - Wikipedia

    en.wikipedia.org/wiki/Two_wrongs_don't_make_a_right

    In rhetoric and ethics, "two wrongs don't make a right" and "two wrongs make a right" are phrases that denote philosophical norms. "Two wrongs make a right" has been considered as a fallacy of relevance , in which an allegation of wrongdoing is countered with a similar allegation.

  4. Double negation - Wikipedia

    en.wikipedia.org/wiki/Double_negation

    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.

  5. Comparison (grammar) - Wikipedia

    en.wikipedia.org/wiki/Comparison_(grammar)

    Comparison is a feature in the morphology or syntax of some languages whereby adjectives and adverbs are rendered in an inflected or periphrastic way to indicate a comparative degree, property, quality, or quantity of a corresponding word, phrase, or clause.

  6. Paradox of tolerance - Wikipedia

    en.wikipedia.org/wiki/Paradox_of_tolerance

    Popper underlines the importance of rational argument, drawing attention to the fact that many intolerant philosophies reject rational argument and thus prevent calls for tolerance from being received on equal terms: [1] Less well known [than other paradoxes] is the paradox of tolerance: Unlimited tolerance must lead to the disappearance of ...

  7. Proof of impossibility - Wikipedia

    en.wikipedia.org/wiki/Proof_of_impossibility

    One of the widely used types of impossibility proof is proof by contradiction.In this type of proof, it is shown that if a proposition, such as a solution to a particular class of equations, is assumed to hold, then via deduction two mutually contradictory things can be shown to hold, such as a number being both even and odd or both negative and positive.

  8. Mere addition paradox - Wikipedia

    en.wikipedia.org/wiki/Mere_addition_paradox

    B− seems better than A+. This is because B− has greater total and average happiness than A+. 3. B seems equally as good as B−, as the only difference between B− and B is that the two groups in B− are merged to form one group in B. Together, these three comparisons entail that B is better than A. However, Parfit also observes the ...

  9. Problem of multiple generality - Wikipedia

    en.wikipedia.org/wiki/Problem_of_multiple_generality

    The best TL can do is to incorporate the second quantifier from each sentence into the second term, thus rendering the artificial-sounding terms 'feared-by-every-mouse' and 'afraid-of-at-least-one-cat'. This in effect "buries" these quantifiers, which are essential to the inference's validity, within the hyphenated terms.