Rough Set Approach to Approximation Reduction in Ordered Decision Table with Fuzzy Decision

Table 3

Upper approximation discernibility matrix 𝑈𝑀_𝑑 of the ODT.

𝑢𝑖,𝑢𝑗	𝑢1	𝑢2	𝑢3	𝑢4	𝑢5	𝑢6
𝑢1	∅	∅	𝑎2	𝑎2	∅	∅
𝑢2	∅	∅	𝑎1,𝑎2	𝑎2	∅	∅
𝑢3	∅	∅	∅	∅	∅	∅
𝑢4	∅	∅	∅	∅	∅	∅
𝑢5	𝑎1,𝑎2,𝑎3	𝑎2	𝑎1,𝑎2	𝑎1,𝑎2	∅	𝑎2
𝑢6	∅	∅	𝑎1,𝑎2	𝑎1,𝑎2	∅	∅