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  1. Aristotelian and Boolean Properties of the Keynes-Johnson Octagon of Opposition.Lorenz Demey & Hans Smessaert - 2024 - Journal of Philosophical Logic 53 (5):1265-1290.
    Around the turn of the 20th century, Keynes and Johnson extended the well-known square of opposition to an octagon of opposition, in order to account for subject negation (e.g., statements like ‘all non-S are P’). The main goal of this paper is to study the logical properties of the Keynes-Johnson (KJ) octagons of opposition. In particular, we will discuss three concrete examples of KJ octagons: the original one for subject-negation, a contemporary one from knowledge representation, and a third one (hitherto (...)
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  • Varieties of Cubes of Opposition.Claudio E. A. Pizzi - 2024 - Logica Universalis 18 (1):157-183.
    The objects called cubes of opposition have been presented in the literature in discordant ways. The aim of the paper is to offer a survey of such various kinds of cubes and evaluate their relation with an object, here called “Aristotelian cube”, which consists of two Aristotelian squares and four squares which are semiaristotelian, i.e. are such that their vertices are linked by some so-called Aristotelian relation. Two paradigm cases of Aristotelian squares are provided by propositions written in the language (...)
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  • Smurfing the Square of Opposition.Jean-Yves Beziau & Alessio Moretti - 2024 - Logica Universalis 18 (1):1-9.
    We discuss the history of the revival of the theory of opposition, with its emerging paradigms of research, and the related events that are organized in this perspective, including the latest one in Leuven in 2022.
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