Exp in mathematics refers to the meaning of exponential function based on natural constant E in higher mathematics. Exponential function is one of the important basic elementary functions. Generally y=ax (a is a constant, take a >；; 0, a≠ 1) is called exponential function, and the domain of the function is R.

In the definition expression of exponential function, the coefficient before ax must be the number 1, and the independent variable x must be in the position of exponent, and it cannot be any other expression of x, otherwise it is not an exponential function.

Exponential function properties:

1, the domain of exponential function is r, where the premise is that a is greater than 0 and not equal to 1. For the case that a is not greater than 0, it will inevitably make the definition domain of the function discontinuous, so it will not be considered, while the function with a equal to 0 is meaningless and generally will not be considered.

2. The range of exponential function is (0, +∞).

3. The exponential function graph is concave.

4. Functions always infinitely tend to a certain direction on the X axis and never intersect.

5. The function always passes (0, 1), (if so, the function has passed the point (0, 1+b)).