Korean J. Math. Vol. 19 No. 2 (2011) pp.219-232
DOI: https://doi.org/10.11568/kjm.2011.19.2.219

THE PROPERTIES OF ROUGH APPROXIMATIONS

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Published: Jun 30, 2011

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Yong Chan Kim
Jung Mi Ko

Abstract

We investigated the properties of rough approximations induced by two families of preordered sets and closure systems. We study the relations among the lower and upper rough approximations, closure and interior systems, preordered sets.



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