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1. Logos & Episteme: Volume > 7 > Issue: 3
Pierre Uzan A propos du renouveau annoncé de la métaphysique
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In this paper, we evaluate the project of resurgence of metaphysics based on the pecularity of the quantum domain, a project that is supported by some contemporary philosophers. Beyond the general arguments against scientific realism that are still applicable here, we show that this project is faced with the three following issues that, we believe, make it unrealizable: (a) the problem raised by the realistic interpretation of the wave function, as a description of a ‘concrete physical fact’ of the independent reality; (b) the lack of any experimental counterpart of the (non-local) hidden variables quantum theories, and, in some cases, their incompatibility with the quantum predictions; and (c) the fact that the key-properties of quantum phenomena, like their non-locality, essentially depend on the observables that are used for their description and cannot then be assigned to any ‘independent’ reality.
2. The Monist: Volume > 19 > Issue: 3
L. Couturat Experience de double traduction en langue internationale
3. Logos & Episteme: Volume > 4 > Issue: 1
Dinu Moscal Logique et grammaire dans la définition du verbe copulatif
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Our objective in this paper is to clearly highlight the linguistic status of the copulative verb, especially with regard to the copula verb to be, with an eye on tracingthe influences of Logic on its approach as a syntactic entity and also on emphasizing the details that led to an eclectic definition. This epistemological approach aims at placing an emphasis on the subject of the diachronic and interdisciplinary copulative verb, in order to observe the way in which the conclusions from the level of the logical approach were transferred to the one of the linguistic approach and also to avoid the misuse of a series of concepts that were established either in a different domain or in the same domain, but at a different level. The main emphasis falls on defining the linguistic predicate through the grammatical tense.
4. Logos & Episteme: Volume > 5 > Issue: 3
Pierre Uzan Logique quantique et intrication
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Due to the failure of the classical principles of bivalence and verifunctionality, the logic of experimental propositions relative to quantum systemscannot be interpreted in Boolean algebras. However, we cannot say neither that this logic is captured by orthomodular lattices, as claimed by many authors along the line of Birkhoff‘s and von Neumann‘s standard approach. For the alleged violation of distributivity is based on the possibility of combining statements relative to complementary contexts, which does not refer to any experience and, consequently, has no meaning. Indeed, quantum logic should be interpreted in partial, transitive Boolean algebras whose compatibility relation limits the application of the connectives within each of its Boolean sub-algebras, which refer to partial, classical descriptions. Moreover, this approach of quantum logic makes it possible to deal with composite systems, which was not possible to do within the standard approach, and then to deal with the fundamental notion of quantum entanglement. The latter notion can be represented by a series of axioms of the object language that restrict the set of experimental statements bearing on a composite system, while its close link to the notion of complementarity can be expressed in the metalanguage.