Computer Science ›› 2009, Vol. 36 ›› Issue (2): 194-198.
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XU You-hong （School of Mathematics,Physics,and Information Science,Zhejiang Ocean University,Zhoushan 316004,China）
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Abstract: Concepts of various types of crisp binary relations as well as fuzzy binary relations were defined, compounds of binary relations were investigated and their properties were examined. Compositions of approximation spaces and approximation operators were a
Key words: Binary relations, Approximation spaces, Approximation operators, Rough sets
XU You-hong （School of Mathematics,Physics,and Information Science,Zhejiang Ocean University,Zhoushan 316004,China）. [J].Computer Science, 2009, 36(2): 194-198.
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