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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.

Registro:

Documento: Artículo
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
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
Volumen:80
Número:6
Página de inicio:1102
Página de fin:1118
DOI: http://dx.doi.org/10.1016/j.jcss.2014.04.004
Título revista:Journal of Computer and System Sciences
Título revista abreviado:J. Comput. Syst. Sci.
ISSN:00220000
CODEN:JCSSB
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