Abstract:
It is well-known that Independence Friendly (IF) logic is equivalent to existential second-order logic (Σ11) and, therefore, is not closed under classical negation. The Boolean closure of IF sentences, called Extended IF-logic, on the other hand, corresponds to a proper fragment of Δ21. In this article we consider SL(↓), IF-logic extended with Hodges' flattening operator ↓, which allows to define a classical negation. SL(↓) contains Extended IF-logic and hence it is at least as expressive as the Boolean closure of Σ11. We prove that SL(↓) corresponds to a weak syntactic fragment of SO which we show to be strictly contained in Δ21. The separation is derived almost trivially from the fact that Σn1 defines its own truth-predicate. We finally show that SL(↓) is equivalent to the logic of Henkin quantifiers, which shows, we argue, that Hodges' notion of negation is adequate. © 2014 Elsevier Inc.
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Documento: |
Artículo
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Título: | Independence friendly logic with classical negation via flattening is a second-order logic with weak dependencies |
Autor: | Figueira, S.; Gorín, D.; Grimson, R. |
Filiación: | Departamento de Computación, FCEyN, Universidad de Buenos Aires, Argentina Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Argentina Ciudad Universitaria, Pabellon i, C1428EGA Buenos Aires, Argentina CS Dept., Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
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Palabras clave: | Expressive power; Flattening operator; Imperfect information logic; Independence friendly logic; Second order logic; Computer networks; Systems science; Expressive power; Flattening operator; Imperfect information; Independence friendly logic; Second-order logic; Formal logic |
Año: | 2014
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Volumen: | 80
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Número: | 6
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Página de inicio: | 1102
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Página de fin: | 1118
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DOI: |
http://dx.doi.org/10.1016/j.jcss.2014.04.004 |
Título revista: | Journal of Computer and System Sciences
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Título revista abreviado: | J. Comput. Syst. Sci.
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ISSN: | 00220000
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CODEN: | JCSSB
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220000_v80_n6_p1102_Figueira |
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Citas:
---------- APA ----------
Figueira, S., Gorín, D. & Grimson, R.
(2014)
. Independence friendly logic with classical negation via flattening is a second-order logic with weak dependencies. Journal of Computer and System Sciences, 80(6), 1102-1118.
http://dx.doi.org/10.1016/j.jcss.2014.04.004---------- CHICAGO ----------
Figueira, S., Gorín, D., Grimson, R.
"Independence friendly logic with classical negation via flattening is a second-order logic with weak dependencies"
. Journal of Computer and System Sciences 80, no. 6
(2014) : 1102-1118.
http://dx.doi.org/10.1016/j.jcss.2014.04.004---------- MLA ----------
Figueira, S., Gorín, D., Grimson, R.
"Independence friendly logic with classical negation via flattening is a second-order logic with weak dependencies"
. Journal of Computer and System Sciences, vol. 80, no. 6, 2014, pp. 1102-1118.
http://dx.doi.org/10.1016/j.jcss.2014.04.004---------- VANCOUVER ----------
Figueira, S., Gorín, D., Grimson, R. Independence friendly logic with classical negation via flattening is a second-order logic with weak dependencies. J. Comput. Syst. Sci. 2014;80(6):1102-1118.
http://dx.doi.org/10.1016/j.jcss.2014.04.004