What are the basic forms of investigation thinking?

Concept, judgment and reasoning are the basic forms of thinking. Judgment is composed of concepts, and reasoning is composed of judgments, so concepts are the cells of thinking and the basis of our thinking. Logic requires us to make clear concepts, make appropriate judgments and make logical reasoning in the process of thinking. Therefore, if there is a problem in concept, you will make wrong judgments and inferences. The concept has two important logical features. That is, any concept has connotation and extension. Connotation is the unique or essential attribute of the object reflected by the concept, and extension is one of the objects reflected by the concept, all of which have the attributes reflected by the connotation of the concept; There are different kinds of concepts, and there are different relationships between them. Concepts are all expressed in words, which are closely related and have essential differences. The basic knowledge about concepts provided by logic is a necessary condition for us to apply concepts correctly.

Sophists' sophistry techniques in concept application mainly include: playing with words, confusing concepts with ambiguous words and homophonic words; Deliberately misinterpret the connotation and extension of the concept, the flexibility of subjective application of the concept and so on.