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In logic, negation, also called the logical not or logical complement, is an operation that takes a proposition to another proposition "not ", written , , ′ [1] or ¯. [citation needed] It is interpreted intuitively as being true when is false, and false when is true.
A less trivial example of a redundancy is the classical equivalence between and . Therefore, a classical-based logical system does not need the conditional operator " → {\displaystyle \to } " if " ¬ {\displaystyle \neg } " (not) and " ∨ {\displaystyle \vee } " (or) are already in use, or may use the " → {\displaystyle \to } " only as a ...
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 ...
Examples of sentences that are (or make) true statements: "Socrates is a man." "A triangle has three sides." "Madrid is the capital of Spain." Examples of sentences that are also statements, even though they aren't true: "All toasters are made of solid gold." "Two plus two equals five." Examples of sentences that are not (or do not make ...
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.
In logic, a formula is satisfiable if it is true under at least one interpretation, and thus a tautology is a formula whose negation is unsatisfiable. In other words, it cannot be false. Unsatisfiable statements, both through negation and affirmation, are known formally as contradictions.
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. [2]
Double-negation elimination (DNE) is the strongest principle, axiomatized , and when it is added to minimal logic yields classical logic. Ex falso quodlibet (EFQ), axiomatized ⊥ A {\displaystyle \bot \implies A} , licenses many consequences of negations, but typically does not help to infer propositions that do not involve absurdity from ...