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  2. Affirmation and negation - Wikipedia

    en.wikipedia.org/wiki/Affirmation_and_negation

    Complex rules for negation also apply in Finnish; see Finnish grammar § Negation of verbs. In some languages negation may also affect the dependents of the verb; for example in some Slavic languages, such as Polish, the case of a direct object often changes from accusative to genitive when the verb is negated.

  3. Negative conclusion from affirmative premises - Wikipedia

    en.wikipedia.org/wiki/Negative_conclusion_from...

    Statements in syllogisms can be identified as the following forms: a: All A is B. (affirmative) e: No A is B. (negative) i: Some A is B. (affirmative) o: Some A is not B. (negative) The rule states that a syllogism in which both premises are of form a or i (affirmative) cannot reach a conclusion of form e or o (negative). Exactly one of the ...

  4. Negation - Wikipedia

    en.wikipedia.org/wiki/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 ...

  5. Contraposition - Wikipedia

    en.wikipedia.org/wiki/Contraposition

    In some cases, contraposition involves a change of the former's quality (i.e. affirmation or negation). [5] For its symbolic expression in modern logic, see the rule of transposition . Contraposition also has philosophical application distinct from the other traditional inference processes of conversion and obversion where equivocation varies ...

  6. Law of excluded middle - Wikipedia

    en.wikipedia.org/wiki/Law_of_excluded_middle

    In logic, the law of excluded middle or the principle of excluded middle states that for every proposition, either this proposition or its negation is true. [1] [2] It is one of the three laws of thought, along with the law of noncontradiction, and the law of identity; however, no system of logic is built on just these laws, and none of these laws provides inference rules, such as modus ponens ...

  7. Dialetheism - Wikipedia

    en.wikipedia.org/wiki/Dialetheism

    Dialetheism (/ d aɪ ə ˈ l ɛ θ i ɪ z əm /; from Greek δι-di-'twice' and ἀλήθεια alḗtheia 'truth') is the view that there are statements that are both true and false. More precisely, it is the belief that there can be a true statement whose negation is also true. Such statements are called "true contradictions", dialetheia, or ...

  8. Negative raising - Wikipedia

    en.wikipedia.org/wiki/Negative_raising

    In linguistics, negative raising is a phenomenon that concerns the raising of negation from the embedded or subordinate clause of certain predicates to the matrix or main clause. [1] The higher copy of the negation, in the matrix clause, is pronounced; but the semantic meaning is interpreted as though it were present in the embedded clause.

  9. Negation introduction - Wikipedia

    en.wikipedia.org/wiki/Negation_introduction

    Negation introduction is a rule of inference, or transformation rule, in the field of propositional calculus. Negation introduction states that if a given antecedent implies both the consequent and its complement, then the antecedent is a contradiction.