Commutativity and self-duality: Two tales of one equation

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Abstract

The mathematical expressions for the commutativity or self-duality of an increasing [0, 1]2→ [0, 1] function F involve the transposition of its arguments. We unite both properties in a single functional equation. The solutions of this functional equation are discussed. Special attention goes to the geometrical construction of these solutions and their characterization in terms of contour lines. Furthermore, it is shown how 'rotating' the arguments of F allows to convert the results into properties for [0, 1]2→ [0, 1] functions having monotone partial functions. © 2008 Elsevier Inc. All rights reserved.

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Maes, K. C., & Baets, B. D. (2009). Commutativity and self-duality: Two tales of one equation. International Journal of Approximate Reasoning, 50(1), 189–199. https://doi.org/10.1016/j.ijar.2008.08.002

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