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研究了因素空间中概念外延的两种近似方法,即反馈外延外包络和反馈外延内包络。首先从概念及其对立概念出发定义了这两种外延近似,讨论了其与粗糙集的上、下近似的关系,得出它们之间具有一致性的结论,并以此给出了两种包络之间的相关性质。随后,讨论了反馈外延包络对概念外延逼近精度问题,给出了四种改善方法。
Two approximate methods of concept extension in factor space are studied, that is, feedback epitaxial envelope and feedback epitaxial envelope. First of all, we define these two kinds of epitaxial approximations from the concept and the concept of its opposition, and discuss the upper and lower approximations of the approximation to the rough set, and draw the conclusion that they have consistency. The nature of the correlation between networks. After that, we discuss the problem of the approximate extension of the concept of the extension of the envelope by feedback epitaxy, and give four improvement methods.