Preimage Relations and Their Matrices
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Information systems (in the sense of Pawlak) are used for representing properties of objects by the means of attributes and their values. However, sometimes there are situations in which we cannot give an exact value of an attribute for an object; we can only approximate the incompletely known value by a subset of values, in which the actual value is expected to be.
KeywordsBinary Relation Information Relation Dence Space Abstract Setting Minimal Subset
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