概念是反映对象本质属性的思维形式,通常说的概念的含义是指概念的内涵,它说明概念所反映的对象的属性。概念的适用范围指概念的外延,它说明概念反映的是哪些对象,内涵和外延是概念的质和量的两个方面,概念在一定的条件下有其确定的内涵和外延,不能混淆。弄清概念的内涵和外延,有助于我们准确地使用概念。所谓概念明确,就是要明确概念所反映的对象有什么本质属性,明确概念所指的是哪些对象。教师讲授一个新的概念时,通常是先举一些实例,通过分析归纳其本质属性,然后给出定义。为了明确外延,通常再给出一些例子,由学生独立作出判断,看其是否具有所述属性,确定该例是否为所论述的对象。如果所选的例题恰当,分析、推理过程合乎逻辑、抓住本质,而且得出的结论明确、简炼,所确定 Concept is a thinking form that reflects the nature of an object. The meaning of a conceptual concept usually refers to the connotation of the concept. It describes the attributes of the object that the concept reflects. The scope of the concept refers to the extension of the concept. It explains which objects the concept reflects, the connotation and extension are the two aspects of the quality and quantity of the concept. The concept has its definite connotation and extension under certain conditions and cannot be confused. Understanding the connotation and extension of the concept helps us to use the concept accurately. The so-called concept is clear, it is to clear the concept of the object reflects the nature of what attributes, clear what the concept refers to which objects. When a teacher teaches a new concept, it usually starts with some examples, summarizes its essential attributes through analysis, and then gives a definition. In order to clarify the extensions, some examples are usually given, and the students make independent judgments to see if they have the attributes and determine whether the example is the object being discussed. If the selected example questions are appropriate, the analysis and reasoning process is logical and the essence is grasped, and the conclusions drawn are clear and concise.