Computer Science ›› 2005, Vol. 32 ›› Issue (12): 168-171.
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QU Kai-She, ZHAI Yan-Hui ,LI De-Yu, LIANG Ji-Ye （School of Computing and Information Technology, Shanxi University, Taiyuan 030006）
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Abstract: The notion of an information system homomorphism, as a powerful tool to study the relation between two information systems, is introduced by J. W. Grzymala-Busse. This paper discusses some characters of information system homomorphism, reveals the interde
Key words: Information system,Rough set theory,Upper approximation,Lower approximation,Mapping
QU Kai-She, ZHAI Yan-Hui ,LI De-Yu, LIANG Ji-Ye （School of Computing and Information Technology, Shanxi University, Taiyuan 030006）. [J].Computer Science, 2005, 32(12): 168-171.
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