1, determine the central theme: determine the theme to be drawn in mind map, such as power function, exponential function, logarithmic function, etc. Take the theme as the central theme, and unfold around this central theme.

2. List the main branches: for each topic, list its important concepts, attributes, applications, etc. These main branches will become the second layer of the mind map.

3. Add details: For each main branch, further add relevant details, such as specific formulas, definitions, theorems, etc. These details will serve as the third level or lower branches of the mind map.

4. Use graphics and colors: In order to make mind maps more attractive and readable, you can use graphics, colors, marks, etc. Focus or classify. For example, lines or shapes of different colors can be used to represent different categories or concepts.

5. Check and improve: After completing the mind map, check whether there are any omissions or mistakes and improve them.

Origin of function

The word "function" used in China's math book is translated. It was Li, an algebra expert in China's Qing Dynasty, who translated "function" into "function" when he translated the book Algebra 1859.

In ancient China, the word "Xin" and the word "Han" were universal and both had the meaning of "Han". Li's definition is: "every formula contains heaven, which is a function of heaven."

In ancient China, four words were used to represent four different unknowns or variables: heaven, earth, people and things. The meaning of this definition is: "Whenever a formula contains a variable X, the formula is called a function of X", so "function" means that the formula contains a variable. The exact definition of an equation refers to an equation containing unknowns.