- double negation rule
- закон двойного отрицания
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
Negation — For other uses, see Negation (disambiguation). In logic and mathematics, negation, also called logical complement, is an operation on propositions, truth values, or semantic values more generally. Intuitively, the negation of a proposition is… … Wikipedia
Double negative elimination — In propositional logic, the inference rules double negative elimination (also called double negation elimination, double negative introduction, double negation introduction, or simply double negation) allow deriving the double negative equivalent … Wikipedia
Double negative — This article is about the linguistic construct. For other uses, see Double Negative (disambiguation). A double negative occurs when two forms of negation are used in the same sentence. Multiple negation is the more general term referring to the… … Wikipedia
Negation (linguistics) — In rhetoric, where the role of the interpreter is taken into consideration as a non negligible factor, negation bears a much wider range of functions and meanings than it does in logic, where the interpretation of signs for negation is… … Wikipedia
formal logic — the branch of logic concerned exclusively with the principles of deductive reasoning and with the form rather than the content of propositions. [1855 60] * * * Introduction the abstract study of propositions, statements, or assertively used … Universalium
Boolean algebras canonically defined — Boolean algebras have been formally defined variously as a kind of lattice and as a kind of ring. This article presents them more neutrally but equally formally as simply the models of the equational theory of two values, and observes the… … Wikipedia
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Propositional calculus — In mathematical logic, a propositional calculus or logic (also called sentential calculus or sentential logic) is a formal system in which formulas of a formal language may be interpreted as representing propositions. A system of inference rules… … Wikipedia
Intuitionistic logic — Intuitionistic logic, or constructive logic, is a symbolic logic system differing from classical logic in its definition of the meaning of a statement being true. In classical logic, all well formed statements are assumed to be either true or… … Wikipedia
Boolean algebra — This article discusses the subject referred to as Boolean algebra. For the mathematical objects, see Boolean algebra (structure). Boolean algebra, as developed in 1854 by George Boole in his book An Investigation of the Laws of Thought,[1] is a… … Wikipedia
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