Abstract
There has been a renewal of interest in the use of squares of opposition and other related structures in the last decade, both for discussing issues in logical modeling and for their cognitive relevance. This paper outlines and motivates graded extensions of these structures (square, hexagon, cube, tetrahedron) of oppositions.
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Due to \(N(\overline{A})) = 1 - \varPi (A)\), it comes \(\max (0, \min (1,N(A) + N(\overline{A})) + \varPi (A) - 1) = \min (1 - N(\overline{A}), N(A)) = N(A)\) since \(\varPi (A) \ge N(A)\).
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Dubois, D., Prade, H. (2015). Gradual Structures of Oppositions. In: Magdalena, L., Verdegay, J., Esteva, F. (eds) Enric Trillas: A Passion for Fuzzy Sets. Studies in Fuzziness and Soft Computing, vol 322. Springer, Cham. https://doi.org/10.1007/978-3-319-16235-5_7
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