Abstract
An approximation space can be defined as a quintuple \( \mathcal{A} = (T,U,F,\Phi ,\Gamma ) \), where F: T → U is a multifunction and Φ and Γ are unary operations on the power set of U.
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Maritz, P. (1998). Multifunctions as Approximation Operations in Generalized Approximation Spaces. In: Polkowski, L., Skowron, A. (eds) Rough Sets and Current Trends in Computing. RSCTC 1998. Lecture Notes in Computer Science(), vol 1424. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-69115-4_19
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DOI: https://doi.org/10.1007/3-540-69115-4_19
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