关键词: 形式概念分析, 属性约简, 限定性属性, 种类, 本质属性, 预处理, 可约属性, 属性分类

Abstract: The terms of essential attribute, attached attribute and restrictive attribute are defined in formal language, their properties and intrinsic links are discussed, and a new classification method is obtained. In conjunction with a new operation for subset of attribute, the characteristic of essential attribute is discussed in particular, and thus the notion of kind in IDEF5 is amended formally. Simultaneously, when there are a plurality of essential attributes, research shows that only one should be reserved, any other item must be reducible attribute and also unnecessary attribute, while the verification of essential attribute is simple and easy, part of attributes can be eliminated before utilizing some algorithm to process attribute reduction. Finally, an example is used to illustrate the advantage of such preprocessing.

Key words: formal concept analysis, attribute reduction, restrictive attribute, kind, essential attribute, preprocessing, reducible attribute, attribute classification