How to | Change the Form of Input and Output
The user interface for the Wolfram System provides many options for formatting input and output.
The sum of from to is :
While correct, this does not look like traditional mathematics. Select the cell group, then choose the menu item ▶▶:
Alternatively, if you only want to format the answer, apply TraditionalForm:
InputForm and StandardForm work in reverse.
Use InputForm to find out how to type an expression into the Wolfram Language:
StandardForm is more compact than InputForm and is unambiguous to the Wolfram Language:
TraditionalForm is sometimes ambiguous; in this case, the Wolfram Language treats f first as a number and then as a function: