Abstract
In the chapter we present a tool for reasoning about covering-based rough sets in the form of three-valued logic in which the value t corresponds to the positive region of a set, the value f — to the negative region and the undefined value u — to the boundary of a given set. Atomic formulas of the logic represent either membership of objects of the universe in rough sets or the subordination relation between objects generated by the covering underlying the approximation space, and complex formulas are built out of the atomic ones using three-valued Kleene connectives. We give a strongly sound sequent calculus for the logic defined in this way and prove its strong completeness for a subset of its language.
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Konikowska, B. (2013). Three-Valued Logic for Reasoning about Covering-Based Rough Sets. In: Skowron, A., Suraj, Z. (eds) Rough Sets and Intelligent Systems - Professor Zdzisław Pawlak in Memoriam. Intelligent Systems Reference Library, vol 42. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30344-9_16
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DOI: https://doi.org/10.1007/978-3-642-30344-9_16
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