外延定义是揭示外延意义的逻辑方法。通过揭示外延意义来明确概念或语词。具体可分为实指定义（又称实指的外延定义）、列举定义（又称非实指的外延定义）和划分定义三种。实指定义、列举定义和划分定义的被定义项Ds都是一个概念或语词，但它们的定义项则有所不同。实指定义的定义项Dp是实物，列举定义的定义项Dp是一组专名，划分定义的定义项Dp则是被定义项的小类或种。
从现有的教学概念的定义出发，对教学概念进行内涵定义和外延定义的分析，从而达到对教学概念的基本的认识。
Based on the present notion of teaching, the article analyses the notion of teaching from connotation and extension, and then we can have a basic realization of teaching notion.
正文的第一章为基础部分，主要讨论了时间副词的定义及对其外延的界定。
The first chapter of the text is a basic section, which mainly discusses the definition and the extension of the time adverb.
如果将虚构概念的外延视作零，将使普通逻辑的许多定义、规则产生一系列的矛盾。
If we consider the denotation of fictitious concept not to exists, it will result in a series of contradictions of many definitions and rules of formal logics.
应用推荐