More Rough Sets
          More Rough Sets.  Rough Sets  C = {Major, Birth_Place} 	D = {Grade}  UC = {{1, 3}, {2,5}, {4}.{7}, {8}}	C({1, 2, 6, 8}) = {6, 8},  ͟ C({4}) =   UD = {{1, 2, 6, 8}, {3, 5, 7}}		 ͟ C({3, 5, 7}) = {7}  C   k  D = |POS C (D)|/|U| + 4/8 = 1/2.  Rough Sets – Dispensable and Indispensable Attributes
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