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Pseudocode to update approximations using pre-defined four rules, is given here. We assume that we have previous information about the decision classes and approximation sets. We have already updated decision classes in step 1. When we compare single object, our proposed algorithm deletes it from all relevant approximations sets simultaneously. We start from the first object which leaves the information system. We check all four proposed rules and delete object from all relevant lower and upper approximation sets. Similarly, we check all objects which leave the system, one by one and update approximations.
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IEEE/ICACT20220156 Slide.24
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