Granule structures in formal contexts from covering rough set aspect

Formal concept analysis and covering rough set theory are two important mathematical tools for knowledge representation and knowledge discovery. Formal context is common framework of this two theories. The set of all extents of al object concepts of a formal context is a basic granulation of the object set, by which many compound granules can be generated. This paper focuses on the granular comuting based on the basic granulation. With respect to formal concept analysis and covering rough set theory, the granular structures in formal context are examined in detail.