How to | Change the Form of Input and Output
The user interface for Mathematica provides many options for formatting input and output.
The sum of 
from 
to 
is 
:
| Out[67]= |  |
While correct, this does not look like traditional mathematics. Select the cell group, then choose the menu item ►►:
| Out[959]= |  |
Alternatively, if you only want to format the answer, apply TraditionalForm:
Out[68]//TraditionalForm= |
| |  |
InputForm and StandardForm work in reverse.
Use InputForm to find out how to type an expression into Mathematica:
Out[70]//InputForm= |
| |  |
StandardForm is more compact than InputForm and is unambiguous to Mathematica:
Out[71]//StandardForm= |
| |  |
TraditionalForm is sometimes ambiguous; in this case, Mathematica treats 
first as a number and then as a function:
Out[72]//StandardForm= |
| |  |
