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Erschienen in: Soft Computing 7/2019

29.10.2018 | Focus

Combining fragments of classical logic: When are interaction principles needed?

verfasst von: Carlos Caleiro, Sérgio Marcelino, João Marcos

Erschienen in: Soft Computing | Ausgabe 7/2019

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Abstract

We investigate the combination of fragments of classical logic as a way of conservatively extending a given Boolean logic by the addition of new connectives, and we precisely characterize the circumstances in which such a combination produces the corresponding fragment of classical logic over the signature containing connectives from both fragments given as input. If the thereby produced combined fragment is only incompletely characterized by the components given as input, this means that connectives from one component need to interact with connectives from the other component, giving rise to interaction principles. The main contributions strongly rely on the (well-known) description of the 2-valued clones made by Post, on the (not so well-known) axiomatization procedures for 2-valued matrices laid out by Rautenberg, and on Avron’s non-deterministic matrices, which have (recently) been used to produce a significant advance on the understanding of the semantics of fibring.

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Fußnoten
1
\({\langle V,\cdot _{\mathbb {M}}\rangle }\) is a multi-algebra, see Grätzer (1962) and Corsini and Leoreanu (2009).
 
2
The problem is that, while it is true that any logical matrix \(\mathbb {M}\) and any translation \({\mathbf {t}}:\Xi \longrightarrow L_\Sigma (P)\) allow one to interpret unambiguously any derived connective, so that \(\text {Val}_P(\mathbb {M}^{\mathbf {t}})=\{v\circ {\mathbf {t}}:v\in \text {Val}_P(\mathbb {M})\}\), the latter equality is not true, in general, if \(\mathbb {M}\) is an Nmatrix. For an example of that, suppose the 1-place derived connective \({\sim }\in \Xi \) is introduced through \({\mathbf {t}}\) as https://static-content.springer.com/image/art%3A10.1007%2Fs00500-018-3584-0/MediaObjects/500_2018_3584_IEq1562_HTML.gif , where  https://static-content.springer.com/image/art%3A10.1007%2Fs00500-018-3584-0/MediaObjects/500_2018_3584_IEq1563_HTML.gif is the Boolean implication and \(\bot \top \) is an unrestrained 0-place connective. In that case, the induced Nmatrix \(\mathbb {M}^{\mathbf {t}}\) would take \({\sim }_{\mathbb {M}^{\mathbf {t}}}=\{0,1\}\), while the original Nmatrix \(\mathbb {M}\) can only allow \({\sim }_{\mathbb {M}}\) to be affirmation connective or the negation connective.
 
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Metadaten
Titel
Combining fragments of classical logic: When are interaction principles needed?
verfasst von
Carlos Caleiro
Sérgio Marcelino
João Marcos
Publikationsdatum
29.10.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Soft Computing / Ausgabe 7/2019
Print ISSN: 1432-7643
Elektronische ISSN: 1433-7479
DOI
https://doi.org/10.1007/s00500-018-3584-0

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