Abstract
Based on cognitive operators, granular reduct of dynamic formal context is studied. By using the cognitive operators, in the background of non-decision formal context, the new discernibility attribute sets in different states are given respectively when the objects and the attributes increased. According to the Boolean reasoning method, the relation between the new reduct and original reduct is proved when objects and attributes increased. Finally, we formulate updated algorithms for new granular reduct when objects and attributes are added.
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