Temporal dynamics in information tables. (English) Zbl 1237.68212

Summary: An information table can change over time in several different ways: objects enter/exit the system, new attributes are considered, etc. As a consequence rough set instruments also change. At first, we recall a classification of dynamic increase of information with respect to three different factors: objects, attributes, values. Then, the corresponding changes in rough sets are discussed. Results about approximations, positive region and generalized decision are given and algorithms to update reducts and rules provided.


68T30 Knowledge representation
68T37 Reasoning under uncertainty in the context of artificial intelligence
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