Domain: Let A and B be two sets of non-empty numbers. If any number X in set A has a unique number f(x) corresponding to it according to a certain correspondence F, then F: A-B is called a function from set A to set B, denoted as Y = F (x), and X belongs to set A ... where X is called an independent variable, and the value range A of X is called the definition domain of the function;

Range: In a function, the range of the dependent variable is called the range of the function, which is the set of all values of the dependent variable in the definition domain in mathematics.