de Morgan formulas

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• De Morgan, Augustus — ▪ English mathematician and logician born , June 27, 1806, Madura, India died March 18, 1871, London, Eng.       English mathematician and logician whose major contributions to the study of logic include the formulation of De Morgan s laws and… …   Universalium

• MSCI — Morgan Stanley Capital International (MSCI o MSCI barra) es un proveedor de índices sobre acciones, bonos y hedge funds. Morgan Stanley es el accionista mayoritario junto a The Capital Group Companies. Los índices MSCI son utilizados como índices …   Wikipedia Español

• Heyting algebra — In mathematics, Heyting algebras are special partially ordered sets that constitute a generalization of Boolean algebras, named after Arend Heyting. Heyting algebras arise as models of intuitionistic logic, a logic in which the law of excluded… …   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

• Propositional formula — In propositional logic, a propositional formula is a type of syntactic formula which is well formed and has a truth value. If the values of all variables in a propositional formula are given, it determines a unique truth value. A propositional… …   Wikipedia

• Cálculo lógico — Saltar a navegación, búsqueda El cálculo lógico, o derivación lógica, es un algoritmo que permite cómoda y fácilmente inferir o deducir un enunciado verdadero a partir de otro u otros que se tienen como válidamente verdaderos. La inferencia o… …   Wikipedia Español

• logic, history of — Introduction       the history of the discipline from its origins among the ancient Greeks to the present time. Origins of logic in the West Precursors of ancient logic       There was a medieval tradition according to which the Greek philosopher …   Universalium

• Lógica proposicional — En lógica, la lógica proposicional es un sistema formal diseñado para analizar ciertos tipos de argumentos. En lógica proposicional, las fórmulas representan proposiciones y las conectivas lógicas son operaciones sobre dichas fórmulas, capaces de …   Wikipedia Español

• 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

• Dependence logic — is a logical formalism, created by Jouko Väänänen[1], which adds dependence atoms to the language of first order logic. A dependence atom is an expression of the form , where are terms, and corresponds to the statement that the value of is… …   Wikipedia

• MAGIC — Early Magic Broadly defined, magic is a system of non canonical ritual practices aiming at changing reality. In early Jewish magic this system was based on the use of powerful verbal performative formulae – incantations – whose oral or written… …   Encyclopedia of Judaism