南京大学学报(自然科学版) ›› 2013, Vol. 49 ›› Issue (2): 244–249.
李进金，李克典**，吴燕华
Li .Jin-.Jin ,Li Ke －Dian ,Wu Yan－Hua
摘要： 探讨在形式背景中的任意概念，由其外延形成的上近似概念和下近似概念，以及由其内涵形
成的上近似概念和下近似概念这四者之间的关系.在形式背景中，从任意对象集(或属性集)出发，利用
确定的概念格建立该对象(或属性)的下近似概念外延(或内涵)与上近似外延(或内涵)，从而得到由对
象(或属性)集形成的上近似概念和下近似概念;对于任意一概念，由其外延形成的上近似概念和下近似
概念是它木身，且由其内涵形成的上近似概念和下近似概念也是它木身.通过实例说明这种方法的可行
性，由此得到概念格理论中，生成上(下)近似概念的一种有效方法.
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