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IEEE/ICACT20220156 Slide.07        [Big Slide]	Oral Presentation
	In dominance based rough set theory, we have a finite number of classes in a decision system, but decision classes are preference ordered, an upward union of classes and downward union of classes. Mathematically, the upward union of class t contains all objects of class t and more preferred than class t and downward union of class t contains all objects of class t and less preferred than class t.

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