Elementary function
The elementary function (the basic function) is a finite number of rational operations (additive, subtractive, multiplication, multiplication, rational multiplication, multiplication), the exponential function, the logarithmic function, the trigonometric function and the inverse trigonometric function. Square) and a finite number of functions, and a function that can be represented by an equation on the domain. In general, the segmentation function is not an elementary function because it can not be represented by a analytic representation on the domain of these segment functions. ...