25 found
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  1.  9
    Normalization, Soundness and Completeness for the Propositional Fragment of Prawitz’ Ecumenical System.Luiz Carlos Pereira & Ricardo Oscar Rodriguez - 2017 - Revista Portuguesa de Filosofia 73 (3-4):1153-1168.
    In 2015 Dag Prawitz proposed an Ecumenical system where classical and intuitionistic logic could coexist in peace. The classical logician and the intuitionistic logician would share the universal quantifier, conjunction, negation and the constant for the absurd, but they would each have their own existential quantifier, disjunction and implication, with different meanings. Prawitz’ main idea is that these different meanings are given by a semantical framework that can be accepted by both parties. The aim of the present paper is [1] (...)
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  2.  14
    A New Normalization Strategy for the Implicational Fragment of Classical Propositional Logic.Luiz C. Pereira, Edward H. Haeusler, Vaston G. Costa & Wagner Sanz - 2010 - Studia Logica 96 (1):95-108.
    The introduction and elimination rules for material implication in natural deduction are not complete with respect to the implicational fragment of classical logic. A natural way to complete the system is through the addition of a new natural deduction rule corresponding to Peirce's formula → A) → A). E. Zimmermann [6] has shown how to extend Prawitz' normalization strategy to Peirce's rule: applications of Peirce's rule can be restricted to atomic conclusions. The aim of the present paper is to extend (...)
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  3.  46
    Algumas considerações sobre a noção construtiva de verdade.André Porto & Luiz Pereira - 2003 - O Que Nos Faz Pensar:107-123.
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  4.  43
    Considerações sobre a Noção Construtiva de Verdade.André Porto & Luiz Carlos Pereira - 2003 - Philósophos - Revista de Filosofia 17:107-123.
    O artigo discute as recentes propostas de uma noção construtivista de verdade que não se confunda com condições de assertabilidade.
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  5. A New Proof System for Intuitionistic Logic.Valeria de Paiva & Luiz C. Pereira - 1995 - Bulletin of Symbolic Logic 1 (1):101.
  6.  22
    An Infinitary Extension of Mall−.Luiz Carlos Pd Pereira & Edward Hermann Haeusler - 1999 - Bulletin of the Section of Logic 28 (4):225-233.
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  7.  31
    A Short Note on Intuitionistic Propositional Logic with Multiple Conclusions.Valéria de Paiva & Luiz Pereira - 2005 - Manuscrito 28 (2):317-329.
    A common misconception among logicians is to think that intuitionism is necessarily tied-up with single conclusion calculi. Single conclusion calculi can be used to model intuitionism and they are convenient, but by no means are they necessary. This has been shown by such influential textbook authors as Kleene, Takeuti and Dummett, to cite only three. If single conclusions are not necessary, how do we guarantee that only intuitionistic derivations are allowed? Traditionally one insists on restrictions on particular rules: implication right, (...)
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  8.  13
    The Logical Impingement of Artifical Intelligence.Luíz Moniz Pereira - 1998 - Grazer Philosophische Studien 56:183-204.
    We address the impingement of Artificial Intelligence on logic, by examining the requirements posed on logic by knowledge representation and reasoning issues which A I has addressed. We then outline some of AI's contributions, via Logic Programming, to more dynamic forms of logic, in order to deal with knowledge in flux, namely: incomplete and contradictory information; hypotheses making through abduction; argumentation; diagnosis and debugging; updating; and learning. Along the way we delve into implications for the philosophy of knowledge.
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  9. A escolha do livro didático de sociologia em Porto alegre.Luiza Helena Pereira - 2014 - Saberes Em Perspectiva 4 (8):133-145.
    Dando continuidade à Pesquisa sobre a Sociologia no Ensino Médio no Rio Grande do Sul, examinou­se o processo de escolha do livro didático de sociologia nas escolas públicas de Porto Alegre, pois a disciplina só veio a ser contemplada pelo Ministério de Educação e Cultura ­ MEC, no Programa Nacional do Livro Didático – PNLD a partir de 2011. Essa escolha gerou uma interessante investigação do ponto de vista sociológico, pois possibilita pensar a vigilância epistemológica sobre nossos próprios pares, sociólogos/professores, (...)
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  10.  32
    Review of Michael Detlefsen (Ed.), Proof, Logic and Formalization; and Michael Detlefsen (Ed.), Proof and Knowledge in Mathematics. [REVIEW]Luiz Carlos Pereira - 1997 - Erkenntnis 47 (2):245-254.
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  11.  11
    A Formalization of Sambins's Normalization for GL.Edward Hermann Haeusler & Luiz Carlos Pereira - 1993 - Mathematical Logic Quarterly 39 (1):133-142.
    Sambin [6] proved the normalization theorem for GL, the modal logic of provability, in a sequent calculus version called by him GLS. His proof does not take into account the concept of reduction, commonly used in normalization proofs. Bellini [1], on the other hand, gave a normalization proof for GL using reductions. Indeed, Sambin's proof is a decision procedure which builds cut-free proofs. In this work we formalize this procedure as a recursive function and prove its recursiveness in an arithmetically (...)
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  12.  7
    Validades Existenciais e Enigmas Relacionados.Paulo A. S. Veloso, Luiz Carlos Pereira & Edward H. Haeusler - 2009 - Doispontos 6 (2).
    Logic does not have purely existential theorems: the only existential sentences that are valid are those with valid universal analogues. Here, we show indeed this is so, when properly interpreted: every existential validity has a simple universal analogue, which is also valid. We also characterize existential and universal validities in terms of tautologies.
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  13.  2
    The Logical Impingement of Artifical Intelligence.Luíz Moniz Pereira - 1998 - Grazer Philosophische Studien 56:183-204.
    We address the impingement of Artificial Intelligence on logic, by examining the requirements posed on logic by knowledge representation and reasoning issues which A I has addressed. We then outline some of AI's contributions, via Logic Programming, to more dynamic forms of logic, in order to deal with knowledge in flux, namely: incomplete and contradictory information; hypotheses making through abduction; argumentation; diagnosis and debugging; updating; and learning. Along the way we delve into implications for the philosophy of knowledge.
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  14.  4
    The Semantics of Falsity and Negation.Luiz Pereira - 2004 - Manuscrito 27 (1):183-191.
    In Logical Forms Chateaubriand offers a realist semantics for false elementary propositions and for true negative propositions that appeals to negative facts. Although he does not refer to Wittgenstein, he rules out “possibilist” solutions such as that of the Tractatus. In this paper I will critically discuss Chateaubriand’s solution and compare it with the semantics of the Tractatus.
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  15.  2
    9th Workshop on Logic, Language, Information and Computation.Ruy B. de Queiroz, Luiz Pereira & Edward Haeusler - 2002 - Logic Journal of the IGPL 10 (6):679-688.
  16.  1
    Michael Detlefsen , Proof, Logic and Formalization. Michael Detlefsen , Proof and Knowledge in Mathematics.Luiz Pereira - 1997 - Erkenntnis 47 (2):245-254.
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  17. Logic, Sets and Information: Proceedings of the Tenth Brazilian Conference on Mathematical Logic.Walter A. Carnielli & Luiz Carlos P. D. Pereira (eds.) - 1995 - Centro de Lógica, Epistemologia e História da Ciência, Unicamp.
    Proceedings of the Tenth Brazilian Conference on Mathematical Logic. Coleção CLE, volume 14, 1995. Centro De Lógica, Epistemologia e História da Ciência, Unicamp, Campinas, SP, Brazil.
     
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  18. Apresentação.Déborah Danowski & Luiz Pereira - 2004 - O Que Nos Faz Pensar:5.
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  19. The Rules-as-Types Interpretation of Schroder-Heister's Extension of Natural Deduction.Edward Hermann Haeusler & Luiz Carlos Pd Pereira - 1999 - Manuscrito 22 (2):149.
     
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  20. A Formalization Of Sambins's Normalization For Gl.Edward Hauesler & Luiz Carlos Pereira - 1993 - Mathematical Logic Quarterly 39 (1):133-142.
    Sambin [6] proved the normalization theorem for GL, the modal logic of provability, in a sequent calculus version called by him GLS. His proof does not take into account the concept of reduction, commonly used in normalization proofs. Bellini [1], on the other hand, gave a normalization proof for GL using reductions. Indeed, Sambin's proof is a decision procedure which builds cut-free proofs. In this work we formalize this procedure as a recursive function and prove its recursiveness in an arithmetically (...)
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  21. Alguns resultados sobre fragmentos com negação da lógica clássica.Luiz Pereira, Edward Hauesler & Maria de Medeiros - 2008 - O Que Nos Faz Pensar:105-111.
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  22. Breves considerações sobre o niilismo e o revisionismo na lógica.Luiz Pereira - 2006 - O Que Nos Faz Pensar:91-99.
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  23. On the Estimation of the Length of Normal Derivations.Luiz Carlos P. D. Pereira - 1982 - Akademilitteratur.
     
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  24. A Categorical Approach To Higher-Level Introduction And Elimination Rules.Haydee Poubel & Luiz Pereira - 1994 - Reports on Mathematical Logic:3-19.
    A natural extension of Natural Deduction was defined by Schroder-Heister where not only formulas but also rules could be used as hypotheses and hence discharged. It was shown that this extension allows the definition of higher-level introduction and elimination schemes and that the set $\{ \vee, \wedge, \rightarrow, \bot \}$ of intuitionist sentential operators forms a {\it complete} set of operators modulo the higher level introduction and elimination schemes, i.e., that any operator whose introduction and elimination rules are instances of (...)
     
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  25. Validades Existenciais e Enigmas Relacionados.Paulo Veloso, Luiz Pereira & Edward Haeusler - 2009 - Dois Pontos 6 (2).
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