J4 ›› 2010, Vol. 45 ›› Issue (1): 89-93.

• Articles • Previous Articles     Next Articles

Reductions about covering decision information system

  

  1.  XU Qing-Yuan,  ZHANG Yan-Lan:Department of Computer Science and Engineering, Zhangzhou Normal University,Zhangzhou 363000, Fujian, China;  LI Jin-Jin:Department of Mathematics, Zhangzhou Normal University, Zhangzhou 363000, Fujian, China
  • Received:2009-01-21 Online:2010-01-16 Published:2010-03-25

Abstract:

By using inclusion degree between sets, the relationships among covering decision reduction, covering distribution reduction and the largest coveringdistribution reduction about covering decision information system are discussed. Also the characterizations of covering upper and lower approximation reductionabout inconsistent covering decision information system and their relationshipsto covering distribution reduction and the largest covering distribution reduction are studied. The results generalize and deepen the reduction theories of decision information system.

Key words: inclusion degree; covering decision information system; reduction

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