Propositional Logic
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. ON A NEW APPROACH TO PEIRCE’S THREE-VALUE PROPOSITIONAL LOGIC
Abstract In 1909, Peirce recorded in a few pages of his logic notebook some experiments with matrices for three-valued propositional logic. These notes are today recognized as one of the first attempts to create non-classical formal systems. However, besides the articles published by Turquette in the 1970s and 1980s, very little progress has been made toward
Manuscrito. Publicado em: 2022
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2. Paradoxical versus modulated conditional inferences: An explanation from the Stoicism
Abstract According to standard propositional logic, the inferences in which the conditional introduction rule is used are absolutely correct. However, people do not always accept inferences of that kind. Orenes and Johnson-Laird carried out interesting experiments in this way and, based on the general framework of the mental models theory, explained clearly
Manuscrito. Publicado em: 2016-03
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3. THE LOGICAL SYSTEM OF FREGE'S GRUNDGESTZE: A RATIONAL RECONSTRUCTION
This paper aims at clarifying the nature of Frege's system of logic, as presented in the first volume of the Grundgesetze . We undertake a rational reconstruction of this system, by distinguishing its propositional and predicate fragments. This allows us to emphasise the differences and similarities between this system and a modern system of classical second
Manuscrito. Publicado em: 2015-06
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4. Árvore de Características e Redes de Petri Colorida com Expressões de Lógica Proposicional: Propostas de Modelagem de Requisitos e Fluxo de Navegação
Geralmente, a análise de requisitos é feita por proposições ad hoc de especialistas. O personagem que detém o conhecimento a respeito do domínio a ser desenvolvido, normalmente, não compreende a linguagem dos especialistas. Assim, as pessoas que deveriam especificar o software são relegadas a um segundo plano, como é o caso de alunos e professores d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011
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5. Formal semantics for propositional attitudes
Contemporary logic is confined to a few paradigmatic attitudes such as belief, knowledge, desire and intention. My purpose is to present a general model-theoretical semantics of propositional attitudes of any cognitive or volitive mode. In my view, one can recursively define the set of all psychological modes of attitudes. As Descartes anticipated, the two p
Manuscrito. Publicado em: 2011-06
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6. Matrix- based logic for avoiding paradoxes and its paraconsistent alternative
The present article shows that there are consistent and decidable many- valued systems of propositional logic which satisfy two or all the three criteria for non- trivial inconsistent theories by da Costa (1974). The weaker one of these paraconsistent system is also able to avoid a series of paradoxes which come up when classical logic is applied to empirica
Manuscrito. Publicado em: 2011-06
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7. Semântica proposicional categórica
The basic concepts of what later became called category theory were introduced in 1945 by Samuel Eilenberg and Saunders Mac Lane. In 1940s, the main applications were originally in the elds of algebraic topology and algebraic abstract. During the 1950s and 1960s, this theory became an important conceptual framework in other many areas of mathematical researc
Publicado em: 2010
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8. Concetivos flexiveis : uma abordagem categorial as semanticas de traduções possives
We present a general study of a new formalism of decomposition of logics, the Possible- Translations Coverings (in short PTC s) which constitute a formal version of Possible-Translations Semantics, introduced by W. Carnielli in 1990. We show how the adoption of a more general notion of propositional signatures morphism allows us to define a category Sigω
Publicado em: 2008
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9. Mineração de padrões temporais híbridos especificados na lógica temporal de intervalos
Discovering frequent patterns in databases is an important problem for knowledge discovery and its importance is justified by the diversity of areas where it can be used, such as retail, financial market, medicine, agriculture, farming, telecommunications, etc. The problem of mining frequent patterns in temporal databases, also know as mining temporal patter
Publicado em: 2007
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10. LOGIC PROOFS COMPACTATION / COMPACTAÇÃO DE PROVAS LÓGICAS
É um fato conhecido que provas clássicas podem ser demasiadamente grandes. Estudos em teoria da prova descobriram diferenças exponenciais entre provas normais (ou provas livres do corte) e suas respectivas provas não normais. Por outro lado, provadores automáticos de teorema usualmente se baseiam na construção de provas normais, livres de corte ou pro
Publicado em: 2007
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11. Logica positiva : plenitude, potencialidade e problemas (do pensar sem negação)
This work studies some problems connected to the role of negation in logic, treating the positive fragments of propositional calculus in order to deal with two main questions: the proof of the completeness theorems in systems lacking negation, and the puzzle raised by positive paradoxes like the well-known argument of Haskel Curry. We study the constructive
Publicado em: 2004
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12. Inferências da lógica mental predicativa na compreensão de texto / Predicate mental logic inferences in text comprehension
The model of mental propositional logic of M.D.S. Braine, B.J. Reiser, and B.Rumain (1984) proved to be useful for explaining logical inferences during text comprehension. The use of mental predicate logic proposed by M.D.S. Braine (1998) in text comprehension has not been tested yet. The present study verified the predictions of errorless, effortless and au
Publicado em: 2003