1, the set of all rational numbers is called rational number set, and it is marked as q.

2. The method of expressing the function relationship by listing the values of a series of independent variables and the corresponding function values is the domain function table method.

3. We often use five basic elementary functions, namely exponential function, logarithmic function, power function, trigonometric function and inverse trigonometric function.

4. The definition of a function is that if the variable X is given any value within its range of variation, and the quantity Y always has a certain value corresponding to it according to certain laws, then Y is said to be a function of X. The range of variation of the variable X is called the domain of this function.

5. Monotonically bounded functions must have limits, and functions with limits are not necessarily monotonically bounded.